diff --git a/lib/common/models/page/reservation_menu_page_models.dart b/lib/common/models/page/reservation_menu_page_models.dart
index f446018..05239b4 100644
--- a/lib/common/models/page/reservation_menu_page_models.dart
+++ b/lib/common/models/page/reservation_menu_page_models.dart
@@ -104,6 +104,7 @@ class ReservationQueryPagePreferences {
     this.nameMaskEnabled = true,
     this.verificationEnabled = false,
     this.quickVerificationEnabled = false,
+    this.allowManualMealPeriodChange = true,
     this.selectedMealSlot = ReservationMealSlot.morning,
     this.verificationDateScope = ReservationVerificationDateScope.today,
   });
@@ -117,6 +118,7 @@ class ReservationQueryPagePreferences {
     nameMaskEnabled: true,
     verificationEnabled: false,
     quickVerificationEnabled: false,
+    allowManualMealPeriodChange: true,
     selectedMealSlot: ReservationMealSlot.morning,
     verificationDateScope: ReservationVerificationDateScope.today,
   );
@@ -144,6 +146,9 @@ class ReservationQueryPagePreferences {
   /// 识别查询成功后是否直接打开今天预选餐段的核销弹框，默认关闭以保持旧终端流程。
   final bool quickVerificationEnabled;
 
+  /// 是否允许操作员在查询菜单主动修改餐段；关闭后严格按餐段配置时间自动切换。
+  final bool allowManualMealPeriodChange;
+
   /// 查询菜单最近一次选中的餐段，旧终端未保存时默认早餐。
   final ReservationMealSlot selectedMealSlot;
 
diff --git a/lib/common/utils/app/app_setting_tool.dart b/lib/common/utils/app/app_setting_tool.dart
index 18e3c6a..96e5b7d 100644
--- a/lib/common/utils/app/app_setting_tool.dart
+++ b/lib/common/utils/app/app_setting_tool.dart
@@ -35,6 +35,10 @@ abstract class AppSettingTool {
   static const String _cashierShowHoldActionKey = "cashierShowHoldAction";
   static const String _cashierShowMoreActionKey = "cashierShowMoreAction";
 
+  /// 收银页是否允许主动修改餐段的稳定存储键；缺失时按允许处理，兼容旧终端。
+  static const String _cashierAllowManualMealPeriodChangeKey =
+      "cashierAllowManualMealPeriodChange";
+
   /// 顶部隐藏设备编码列表在现有 sysJson 中的稳定存储键；缺失或空列表表示五项全部显示。
   static const String _hiddenTerminalDeviceStatusesKey =
       "hiddenTerminalDeviceStatuses";
@@ -63,6 +67,10 @@ abstract class AppSettingTool {
   static const String _reservationQueryQuickVerificationEnabledKey =
       "reservationQueryQuickVerificationEnabled";
 
+  /// 查询菜单是否允许主动修改餐段的稳定存储键；缺失时按允许处理，兼容旧终端。
+  static const String _reservationQueryAllowManualMealPeriodChangeKey =
+      "reservationQueryAllowManualMealPeriodChange";
+
   /// 查询菜单最近餐段在现有 sysJson 中的稳定存储键，值使用后端餐段编码且不新增数据库字段。
   static const String _reservationQuerySelectedMealSlotKey =
       "reservationQuerySelectedMealSlot";
@@ -472,25 +480,34 @@ abstract class AppSettingTool {
     });
   }
 
-  /// 读取收银页底部快捷操作显隐；旧终端没有配置时保持两个入口都显示。
-  static Future<({bool showHoldAction, bool showMoreAction})>
-      getCashierPagePreferences() async {
+  /// 读取收银页底部快捷操作显隐及餐段修改权限；旧终端没有配置时保持默认允许。
+  static Future<
+      ({
+        bool showHoldAction,
+        bool showMoreAction,
+        bool allowManualMealPeriodChange,
+      })> getCashierPagePreferences() async {
     final setting = await _getSetting();
     final sysJson = Map<String, dynamic>.from(json.decode(setting.sysJson));
     return (
       showHoldAction: sysJson[_cashierShowHoldActionKey] != false,
       showMoreAction: sysJson[_cashierShowMoreActionKey] != false,
+      allowManualMealPeriodChange:
+          sysJson[_cashierAllowManualMealPeriodChangeKey] != false,
     );
   }
 
-  /// 收银快捷操作属于本机页面布局配置，继续复用 sysJson，避免增加数据库字段。
+  /// 收银快捷操作与餐段修改权限属于本机页面布局配置，继续复用 sysJson。
   static Future<void> setCashierPagePreferences({
     required bool showHoldAction,
     required bool showMoreAction,
+    required bool allowManualMealPeriodChange,
   }) =>
       _updateSysJson((sysJson) {
         sysJson[_cashierShowHoldActionKey] = showHoldAction;
         sysJson[_cashierShowMoreActionKey] = showMoreAction;
+        sysJson[_cashierAllowManualMealPeriodChangeKey] =
+            allowManualMealPeriodChange;
       });
 
   /// 读取商品餐段时间；旧终端无配置或持久化值损坏时返回产品默认时间。
@@ -627,6 +644,9 @@ abstract class AppSettingTool {
       // 快速核销从属于核销入口，旧设置缺键或核销关闭时均不得隐式生效。
       quickVerificationEnabled: verificationEnabled &&
           sysJson[_reservationQueryQuickVerificationEnabledKey] == true,
+      // 旧设置没有该键时保持允许手动修改，避免升级后收银流程被意外锁死。
+      allowManualMealPeriodChange:
+          sysJson[_reservationQueryAllowManualMealPeriodChangeKey] != false,
       selectedMealSlot: selectedMealSlot,
       verificationDateScope: verificationDateScope,
     );
@@ -641,6 +661,7 @@ abstract class AppSettingTool {
     required bool nameMaskEnabled,
     required bool verificationEnabled,
     required bool quickVerificationEnabled,
+    required bool allowManualMealPeriodChange,
     required ReservationVerificationDateScope verificationDateScope,
   }) {
     final normalized = <ReservationRecognitionMethod>[];
@@ -664,6 +685,8 @@ abstract class AppSettingTool {
       sysJson[_reservationQueryVerificationEnabledKey] = verificationEnabled;
       sysJson[_reservationQueryQuickVerificationEnabledKey] =
           verificationEnabled && quickVerificationEnabled;
+      sysJson[_reservationQueryAllowManualMealPeriodChangeKey] =
+          allowManualMealPeriodChange;
       sysJson[_reservationQueryVerificationDateScopeKey] =
           verificationDateScope.code;
     });
diff --git a/lib/common/widgets/app/app_radio_hour_type_dialog.dart b/lib/common/widgets/app/app_radio_hour_type_dialog.dart
index 219c21f..5085d07 100644
--- a/lib/common/widgets/app/app_radio_hour_type_dialog.dart
+++ b/lib/common/widgets/app/app_radio_hour_type_dialog.dart
@@ -13,6 +13,7 @@ import 'package:pj_supermarket_cloud/common/index.dart';
 /// 收银、预订和设置页面继续使用原有的图标与强调色样式。
 /// [checkConfiguredTime] 开启后会在页面初始化完成时校验当前餐段；[ready] 用于等待调用方恢复自身状态。
 /// [currentHourTypeLoader] 允许调用方提供当前配置餐段读取器，未提供时读取本机餐段配置。
+/// [allowManualChange] 关闭后禁止人工切换餐段：选择器只读，且与餐段配置不符时静默切换为配置餐段。
 Widget appRadioHourTypeDialog(
   BuildContext context,
   FRadioSelectGroupController<String> controller, {
@@ -21,6 +22,7 @@ Widget appRadioHourTypeDialog(
   bool enabled = true,
   bool compact = false,
   bool checkConfiguredTime = false,
+  bool allowManualChange = true,
   Future<void>? ready,
   Future<ProductHourType?> Function()? currentHourTypeLoader,
 }) {
@@ -28,13 +30,14 @@ Widget appRadioHourTypeDialog(
     return _MealPeriodSelectionGuard(
       controller: controller,
       ready: ready,
+      allowManualChange: allowManualChange,
       currentHourTypeLoader: currentHourTypeLoader,
       selectorBuilder: (context, candidateController) => _buildHourTypeSelector(
         context,
         candidateController,
         key: key,
         title: title,
-        enabled: enabled,
+        enabled: enabled && allowManualChange,
         compact: compact,
       ),
     );
@@ -44,7 +47,7 @@ Widget appRadioHourTypeDialog(
     controller,
     key: key,
     title: title,
-    enabled: enabled,
+    enabled: enabled && allowManualChange,
     compact: compact,
   );
 }
@@ -191,6 +194,7 @@ class _MealPeriodSelectionGuard extends StatefulWidget {
     required this.controller,
     required this.selectorBuilder,
     this.ready,
+    this.allowManualChange = true,
     this.currentHourTypeLoader,
   });
 
@@ -200,6 +204,9 @@ class _MealPeriodSelectionGuard extends StatefulWidget {
   /// 页面业务初始化信号；为空表示无需等待额外初始化。
   final Future<void>? ready;
 
+  /// 是否允许人工切换餐段；关闭后忽略人工候选并静默跟随餐段配置。
+  final bool allowManualChange;
+
   /// 当前时间命中餐段的读取器；测试可注入固定结果。
   final Future<ProductHourType?> Function()? currentHourTypeLoader;
 
@@ -258,7 +265,8 @@ class _MealPeriodSelectionGuardState extends State<_MealPeriodSelectionGuard> {
       _selectionRevision++;
       _scheduleCheck();
     } else if (oldWidget.ready != widget.ready ||
-        oldWidget.currentHourTypeLoader != widget.currentHourTypeLoader) {
+        oldWidget.currentHourTypeLoader != widget.currentHourTypeLoader ||
+        oldWidget.allowManualChange != widget.allowManualChange) {
       _scheduleCheck();
     }
   }
@@ -289,7 +297,9 @@ class _MealPeriodSelectionGuardState extends State<_MealPeriodSelectionGuard> {
     if (_syncingCandidate) return;
     final candidate = ProductHourType.values.fromCode(values.firstOrNull);
     final committedCode = widget.controller.value.firstOrNull;
-    if (candidate == null ||
+    // 禁止人工修改时任何候选都不受理，候选显示立即回退为已提交餐段。
+    if (!widget.allowManualChange ||
+        candidate == null ||
         candidate == ProductHourType.TOTAL ||
         candidate.code == committedCode) {
       _syncCandidateFromCommitted();
@@ -333,6 +343,9 @@ class _MealPeriodSelectionGuardState extends State<_MealPeriodSelectionGuard> {
   }
 
   /// 校验人工候选或当前缓存餐段；人工确认后提交候选，初始化确认后提交配置餐段。
+  ///
+  /// 禁止人工修改时不弹确认框：与餐段配置不符直接静默切换为配置餐段，
+  /// 当前时间未命中任何餐段时保留原选择，避免把餐段清空成不可用状态。
   Future<void> _checkSelection() async {
     if (_checking || !mounted) return;
     _checking = true;
@@ -350,6 +363,12 @@ class _MealPeriodSelectionGuardState extends State<_MealPeriodSelectionGuard> {
       final configured = await (widget.currentHourTypeLoader?.call() ??
           AppSettingTool.getCurrentProductHourType());
       if (!mounted || revision != _selectionRevision) return;
+      if (!widget.allowManualChange) {
+        if (configured != null && configured != selected) {
+          _commitSelection(configured);
+        }
+        return;
+      }
       if (candidate != null &&
           (configured == null || configured == candidate)) {
         _commitSelection(candidate);
diff --git a/lib/common/widgets/order/select_pay_type_dialog.dart b/lib/common/widgets/order/select_pay_type_dialog.dart
index 4aacf28..cba97a1 100644
--- a/lib/common/widgets/order/select_pay_type_dialog.dart
+++ b/lib/common/widgets/order/select_pay_type_dialog.dart
@@ -1557,7 +1557,7 @@ class _CheckoutCartItem extends StatelessWidget {
   }
 }
 
-/// 套餐购物车行，默认展示全部组成，并将展开热区与数量步进器分离。
+/// 套餐购物车行，默认收起组成明细，并将展开热区与数量步进器分离。
 class _CheckoutComboCartItem extends StatefulWidget {
   /// 创建一条可由主商品整行切换展开状态的套餐记录。
   const _CheckoutComboCartItem({
@@ -1591,8 +1591,8 @@ class _CheckoutComboCartItem extends StatefulWidget {
 
 /// 管理单条套餐的展开状态；状态只属于当前购物车快照条目。
 class _CheckoutComboCartItemState extends State<_CheckoutComboCartItem> {
-  /// 首次打开结算弹框时默认展开，方便收银员直接核对套餐组成。
-  bool _expanded = true;
+  /// 首次打开结算弹框时默认收起组成明细，与查询菜单核销弹框的套餐行为一致。
+  bool _expanded = false;
 
   /// 切换套餐明细；没有组成时不制造无反馈的点击行为。
   void _toggleExpanded() {
diff --git a/lib/pages/terminal/canteen_product/view.dart b/lib/pages/terminal/canteen_product/view.dart
index 6315a88..44f3bbd 100644
--- a/lib/pages/terminal/canteen_product/view.dart
+++ b/lib/pages/terminal/canteen_product/view.dart
@@ -16,6 +16,7 @@ class CanteenProductPage extends GetView<CanteenProductController> {
     super.key,
     this.showHoldAction = true,
     this.showMoreAction = true,
+    this.allowManualMealPeriodChange = true,
   });
 
   /// 是否展示挂单操作入口，由外层收银工作区配置。
@@ -24,6 +25,9 @@ class CanteenProductPage extends GetView<CanteenProductController> {
   /// 是否展示更多操作入口，由外层收银工作区配置。
   final bool showMoreAction;
 
+  /// 是否允许收银页主动修改餐段；关闭后严格按餐段配置时间自动切换。
+  final bool allowManualMealPeriodChange;
+
   /// 构建食堂商品、购物车和餐段筛选工作区。
   @override
   Widget build(BuildContext context) {
@@ -90,6 +94,7 @@ class CanteenProductPage extends GetView<CanteenProductController> {
             title: '餐段',
             compact: true,
             checkConfiguredTime: true,
+            allowManualChange: allowManualMealPeriodChange,
             ready: controller.initialization,
           ).width(280.w),
           cartTitle: '已点菜品',
diff --git a/lib/pages/terminal/cashier/view.dart b/lib/pages/terminal/cashier/view.dart
index 17fbd2e..9acdc12 100644
--- a/lib/pages/terminal/cashier/view.dart
+++ b/lib/pages/terminal/cashier/view.dart
@@ -22,6 +22,7 @@ class _CashierPageState extends State<CashierPage> {
   SysType? _sysType;
   bool _showHoldAction = true;
   bool _showMoreAction = true;
+  bool _allowManualMealPeriodChange = true;
 
   @override
   void initState() {
@@ -37,6 +38,8 @@ class _CashierPageState extends State<CashierPage> {
       _sysType = setting.sysType;
       _showHoldAction = pagePreferences.showHoldAction;
       _showMoreAction = pagePreferences.showMoreAction;
+      _allowManualMealPeriodChange =
+          pagePreferences.allowManualMealPeriodChange;
     });
   }
 
@@ -60,6 +63,7 @@ class _CashierPageState extends State<CashierPage> {
     return CanteenProductPage(
       showHoldAction: _showHoldAction,
       showMoreAction: _showMoreAction,
+      allowManualMealPeriodChange: _allowManualMealPeriodChange,
     );
   }
 }
diff --git a/lib/pages/terminal/menu_query/controller.dart b/lib/pages/terminal/menu_query/controller.dart
index 85d5ec8..a6ae738 100644
--- a/lib/pages/terminal/menu_query/controller.dart
+++ b/lib/pages/terminal/menu_query/controller.dart
@@ -148,6 +148,9 @@ class ReservationMenuQueryController extends GetxController {
   /// 当前操作员在识别前选择的餐段，页面会在多位用户间保留选择以支持连续核销。
   final selectedMealSlot = ReservationMealSlot.morning.obs;
 
+  /// 是否允许在查询菜单主动修改餐段；关闭后严格按餐段配置时间自动切换。
+  final allowManualMealPeriodChange = true.obs;
+
   /// 查询菜单与收银页面共用餐段组件的单选 Controller，值使用后端稳定餐段编码。
   FRadioSelectGroupController<String> get mealSlotC =>
       _hourTypeControl.selection;
@@ -274,6 +277,8 @@ class ReservationMenuQueryController extends GetxController {
       selectedMealSlot.value = _mealSlotForProductHourType(
         _hourTypeControl.selected.value,
       );
+      allowManualMealPeriodChange.value =
+          preferences.allowManualMealPeriodChange;
       verificationDateScope.value = preferences.verificationDateScope;
     } catch (error, stack) {
       // 配置损坏或读取失败时继续使用安全默认值，不能让查询入口不可用。
diff --git a/lib/pages/terminal/menu_query/view.dart b/lib/pages/terminal/menu_query/view.dart
index d71087d..6bfcd49 100644
--- a/lib/pages/terminal/menu_query/view.dart
+++ b/lib/pages/terminal/menu_query/view.dart
@@ -102,6 +102,8 @@ class ReservationMenuQueryPage extends GetView<ReservationMenuQueryController> {
           continuousRecognitionEnabled:
               controller.continuousRecognitionEnabled.value,
           quickVerificationEnabled: controller.quickVerificationEnabled.value,
+          allowManualMealPeriodChange:
+              controller.allowManualMealPeriodChange.value,
           mealPeriodReady: controller.initialization,
           onSelect: controller.selectMethod,
           onStart: controller.startRecognition,
diff --git a/lib/pages/terminal/menu_query/widgets/query_method_panel.dart b/lib/pages/terminal/menu_query/widgets/query_method_panel.dart
index 8d208a2..d9f5dee 100644
--- a/lib/pages/terminal/menu_query/widgets/query_method_panel.dart
+++ b/lib/pages/terminal/menu_query/widgets/query_method_panel.dart
@@ -18,6 +18,7 @@ class QueryMethodPanel extends StatelessWidget {
     required this.autoRecognitionEnabled,
     required this.continuousRecognitionEnabled,
     required this.quickVerificationEnabled,
+    required this.allowManualMealPeriodChange,
     required this.onSelect,
     required this.onStart,
     this.mealPeriodReady,
@@ -44,6 +45,9 @@ class QueryMethodPanel extends StatelessWidget {
   /// 是否开启查询后的快速核销；仅开启时展示核销目标餐段的预选入口。
   final bool quickVerificationEnabled;
 
+  /// 是否允许在查询菜单主动修改餐段；关闭后餐段严格按餐段配置时间自动切换。
+  final bool allowManualMealPeriodChange;
+
   /// 查询页面偏好初始化完成信号，用于在恢复最近餐段后校验当前时间配置。
   final Future<void>? mealPeriodReady;
 
@@ -77,6 +81,7 @@ class QueryMethodPanel extends StatelessWidget {
           enabled: mealSelectionEnabled,
           compact: true,
           checkConfiguredTime: mealPeriodReady != null,
+          allowManualChange: allowManualMealPeriodChange,
           ready: mealPeriodReady,
         ),
       if (autoRecognitionEnabled)
diff --git a/lib/pages/terminal/setting/controller.dart b/lib/pages/terminal/setting/controller.dart
index 08b621e..c010300 100644
--- a/lib/pages/terminal/setting/controller.dart
+++ b/lib/pages/terminal/setting/controller.dart
@@ -60,6 +60,9 @@ class SettingController extends GetxController with WidgetsBindingObserver {
   /// 收银页右下角“更多”快捷操作是否展示。
   final cashierShowMoreAction = true.obs;
 
+  /// 收银页是否允许主动修改餐段；关闭后餐段严格按餐段配置时间自动切换。
+  final cashierAllowManualMealPeriodChange = true.obs;
+
   /// 预约查询识别方式的展示顺序，持久化到现有设置 JSON。
   final reservationQueryMethodOrder = <ReservationRecognitionMethod>[
     ...ReservationRecognitionMethod.values,
@@ -83,6 +86,9 @@ class SettingController extends GetxController with WidgetsBindingObserver {
   /// 查询菜单是否在识别成功后直接打开今天预选餐段的核销弹框。
   final reservationQueryQuickVerificationEnabled = false.obs;
 
+  /// 查询菜单是否允许主动修改餐段；关闭后餐段严格按餐段配置时间自动切换。
+  final reservationQueryAllowManualMealPeriodChange = true.obs;
+
   /// 查询菜单核销允许的日期范围，默认仅限当天。
   final reservationQueryVerificationDateScope =
       ReservationVerificationDateScope.today.obs;
@@ -249,6 +255,8 @@ class SettingController extends GetxController with WidgetsBindingObserver {
     cashierReidentifiablePayTypes.assignAll(reidentifiablePayTypes);
     cashierShowHoldAction.value = cashierPagePreferences.showHoldAction;
     cashierShowMoreAction.value = cashierPagePreferences.showMoreAction;
+    cashierAllowManualMealPeriodChange.value =
+        cashierPagePreferences.allowManualMealPeriodChange;
     reservationQueryMethodOrder.assignAll(
       reservationQueryPreferences.methodOrder,
     );
@@ -264,6 +272,8 @@ class SettingController extends GetxController with WidgetsBindingObserver {
         reservationQueryPreferences.verificationEnabled;
     reservationQueryQuickVerificationEnabled.value =
         reservationQueryPreferences.quickVerificationEnabled;
+    reservationQueryAllowManualMealPeriodChange.value =
+        reservationQueryPreferences.allowManualMealPeriodChange;
     reservationQueryVerificationDateScope.value =
         reservationQueryPreferences.verificationDateScope;
     productMealPeriodSchedule.value = restoredProductMealPeriodSchedule;
@@ -385,6 +395,13 @@ class SettingController extends GetxController with WidgetsBindingObserver {
     _scheduleReservationQueryPreferencesPersist();
   }
 
+  /// 切换查询菜单是否允许主动修改餐段并安排持久化。
+  void setReservationQueryAllowManualMealPeriodChange(bool allowed) {
+    if (reservationQueryAllowManualMealPeriodChange.value == allowed) return;
+    reservationQueryAllowManualMealPeriodChange.value = allowed;
+    _scheduleReservationQueryPreferencesPersist();
+  }
+
   /// 将预约查询页面偏好恢复为产品默认值并安排持久化。
   void resetReservationQueryPreferences() {
     reservationQueryMethodOrder.assignAll(
@@ -396,6 +413,7 @@ class SettingController extends GetxController with WidgetsBindingObserver {
     reservationQueryNameMaskEnabled.value = true;
     reservationQueryVerificationEnabled.value = false;
     reservationQueryQuickVerificationEnabled.value = false;
+    reservationQueryAllowManualMealPeriodChange.value = true;
     reservationQueryVerificationDateScope.value =
         ReservationVerificationDateScope.today;
     _scheduleReservationQueryPreferencesPersist();
@@ -425,6 +443,8 @@ class SettingController extends GetxController with WidgetsBindingObserver {
           verificationEnabled: reservationQueryVerificationEnabled.value,
           quickVerificationEnabled:
               reservationQueryQuickVerificationEnabled.value,
+          allowManualMealPeriodChange:
+              reservationQueryAllowManualMealPeriodChange.value,
           verificationDateScope: reservationQueryVerificationDateScope.value,
         );
       } catch (e, stack) {
@@ -654,10 +674,18 @@ class SettingController extends GetxController with WidgetsBindingObserver {
     _scheduleCashierPagePreferencesPersist();
   }
 
+  /// 切换收银页是否允许主动修改餐段并安排持久化。
+  void setCashierAllowManualMealPeriodChange(bool allowed) {
+    if (cashierAllowManualMealPeriodChange.value == allowed) return;
+    cashierAllowManualMealPeriodChange.value = allowed;
+    _scheduleCashierPagePreferencesPersist();
+  }
+
   /// 将收银页面快捷操作恢复为默认显示状态。
   void resetCashierPagePreferences() {
     cashierShowHoldAction.value = true;
     cashierShowMoreAction.value = true;
+    cashierAllowManualMealPeriodChange.value = true;
     _scheduleCashierPagePreferencesPersist();
   }
 
@@ -678,6 +706,7 @@ class SettingController extends GetxController with WidgetsBindingObserver {
         await AppSettingTool.setCashierPagePreferences(
           showHoldAction: cashierShowHoldAction.value,
           showMoreAction: cashierShowMoreAction.value,
+          allowManualMealPeriodChange: cashierAllowManualMealPeriodChange.value,
         );
       } catch (e, stack) {
         logger.e('|$_tag|保存收银页面配置失败error:|$e|stack:|$stack|');
diff --git a/lib/pages/terminal/setting/widgets/setting_page.dart b/lib/pages/terminal/setting/widgets/setting_page.dart
index dd447f7..6b1d624 100644
--- a/lib/pages/terminal/setting/widgets/setting_page.dart
+++ b/lib/pages/terminal/setting/widgets/setting_page.dart
@@ -175,15 +175,16 @@ class _ReservationQuerySettings extends StatelessWidget {
 
   final SettingController controller;
 
-  /// 组合查询方式、自动识别、隐私和核销设置，并保持各区域独立响应式刷新。
+  /// 组合查询方式、自动识别、隐私、核销和餐段设置，并保持各区域独立响应式刷新。
   @override
   Widget build(BuildContext context) => <Widget>[
         _queryMethodSettings(controller),
         _autoRecognitionSettings(controller),
         _nameMaskSettings(controller),
         _verificationSettings(controller),
+        _mealPeriodSettings(controller),
         SettingNotice(
-          text: '查询顺序、默认项、自动识别、持续识别、姓名脱敏、核销和快速核销配置会在下次进入“查询菜单”时读取。',
+          text: '查询顺序、默认项、自动识别、持续识别、姓名脱敏、核销、快速核销和餐段修改权限配置会在下次进入“查询菜单”时读取。',
           icon: FAssets.icons.circleAlert,
         ),
       ].toColumnSpace(space: XfjDesignTokens.cardGap.h).scrollable();
@@ -344,6 +345,29 @@ Widget _verificationSettings(SettingController controller) => Obx(() {
       return SettingGroup(title: '核销设置', child: rows.toColumn());
     });
 
+/// 查询菜单餐段修改权限独立观察，开关变化不会重建其他查询配置区域。
+Widget _mealPeriodSettings(SettingController controller) => Obx(() {
+      final allowed =
+          controller.reservationQueryAllowManualMealPeriodChange.value;
+      return SettingGroup(
+        title: '餐段设置',
+        child: SettingInfoRow(
+          icon: allowed ? FAssets.icons.sun : FAssets.icons.clock,
+          label: '允许主动修改餐段',
+          subtitle: allowed
+              ? '查询菜单可手动预选餐段；与餐段配置时间不符时仍会弹框提示确认。'
+              : '查询菜单餐段严格按“餐段配置”的时间自动切换，不允许手动修改。',
+          value: allowed ? '允许' : '不允许',
+          showDivider: false,
+          trailing: FSwitch(
+            semanticLabel: '查询菜单允许主动修改餐段',
+            value: allowed,
+            onChange: controller.setReservationQueryAllowManualMealPeriodChange,
+          ),
+        ),
+      );
+    });
+
 /// 排序行由查询方式数据驱动，拖动和上下移动最终都进入同一个 Controller 方法。
 Widget _queryMethodList({
   required SettingController controller,
@@ -438,8 +462,9 @@ class _CashierSettings extends StatelessWidget {
                   ),
           ),
           _cashierActionSettings(controller),
+          _cashierMealPeriodSettings(controller),
           SettingNotice(
-            text: '支付方式顺序和右下角快捷操作都会同步到本机收银页；隐藏仅影响界面展示，不改变服务端权限、钱包范围和渠道支付能力。',
+            text: '支付方式顺序、右下角快捷操作和餐段修改权限都会同步到本机收银页；隐藏仅影响界面展示，不改变服务端权限、钱包范围和渠道支付能力。',
             icon: FAssets.icons.circleAlert,
           ),
         ].toColumnSpace(space: XfjDesignTokens.cardGap.h).scrollable();
@@ -480,6 +505,28 @@ Widget _cashierActionSettings(SettingController controller) => Obx(() {
       );
     });
 
+/// 收银餐段修改权限独立观察，开关变化不会重建上方支付方式拖动列表。
+Widget _cashierMealPeriodSettings(SettingController controller) => Obx(() {
+      final allowed = controller.cashierAllowManualMealPeriodChange.value;
+      return SettingGroup(
+        title: '餐段设置',
+        child: SettingInfoRow(
+          icon: allowed ? FAssets.icons.sun : FAssets.icons.clock,
+          label: '允许主动修改餐段',
+          subtitle: allowed
+              ? '收银页可手动切换餐段；与餐段配置时间不符时仍会弹框提示确认。'
+              : '收银页餐段严格按“餐段配置”的时间自动切换，不允许手动修改。',
+          value: allowed ? '允许' : '不允许',
+          showDivider: false,
+          trailing: FSwitch(
+            semanticLabel: '收银允许主动修改餐段',
+            value: allowed,
+            onChange: controller.setCashierAllowManualMealPeriodChange,
+          ),
+        ),
+      );
+    });
+
 String _defaultPayLabel(OrderPayDisplayType type) {
   return switch (type) {
     OrderPayDisplayType.qrCodeScan => '扫一扫',
diff --git a/test/common/app_radio_hour_type_dialog_test.dart b/test/common/app_radio_hour_type_dialog_test.dart
index 8fad518..a89b984 100644
--- a/test/common/app_radio_hour_type_dialog_test.dart
+++ b/test/common/app_radio_hour_type_dialog_test.dart
@@ -236,6 +236,81 @@ void main() {
     expect(find.textContaining('当前选择的餐段可能有问题'), findsNothing);
     expect(controller.value, {'2'});
   });
+
+  testWidgets('禁止主动修改餐段时初始化静默切换为配置餐段且不弹框', (tester) async {
+    final controller = FRadioSelectGroupController<String>(value: '1');
+    addTearDown(controller.dispose);
+
+    await tester.pumpWidget(
+      _testApp(
+        Builder(
+          builder: (context) => appRadioHourTypeDialog(
+            context,
+            controller,
+            checkConfiguredTime: true,
+            allowManualChange: false,
+            ready: Future.value(),
+            currentHourTypeLoader: () async => ProductHourType.NOON,
+          ),
+        ),
+      ),
+    );
+    await tester.pumpAndSettle();
+
+    expect(find.textContaining('当前选择的餐段可能有问题'), findsNothing);
+    expect(controller.value, {'2'});
+  });
+
+  testWidgets('禁止主动修改餐段时选择器禁用且无法打开餐段菜单', (tester) async {
+    final controller = FRadioSelectGroupController<String>(value: '2');
+    addTearDown(controller.dispose);
+
+    await tester.pumpWidget(
+      _testApp(
+        Builder(
+          builder: (context) => appRadioHourTypeDialog(
+            context,
+            controller,
+            checkConfiguredTime: true,
+            allowManualChange: false,
+            ready: Future.value(),
+            currentHourTypeLoader: () async => ProductHourType.NOON,
+          ),
+        ),
+      ),
+    );
+    await tester.pumpAndSettle();
+
+    await tester.tap(find.byType(FSelectMenuTile<String>));
+    await tester.pumpAndSettle();
+
+    expect(find.byKey(const ValueKey('meal-slot-option-1')), findsNothing);
+    expect(controller.value, {'2'});
+  });
+
+  testWidgets('禁止主动修改餐段时当前时间未命中餐段配置则保持原选择', (tester) async {
+    final controller = FRadioSelectGroupController<String>(value: '1');
+    addTearDown(controller.dispose);
+
+    await tester.pumpWidget(
+      _testApp(
+        Builder(
+          builder: (context) => appRadioHourTypeDialog(
+            context,
+            controller,
+            checkConfiguredTime: true,
+            allowManualChange: false,
+            ready: Future.value(),
+            currentHourTypeLoader: () async => null,
+          ),
+        ),
+      ),
+    );
+    await tester.pumpAndSettle();
+
+    expect(find.textContaining('当前选择的餐段可能有问题'), findsNothing);
+    expect(controller.value, {'1'});
+  });
 }
 
 Widget _testApp(Widget child) {
diff --git a/test/common/cashier_checkout_dialog_test.dart b/test/common/cashier_checkout_dialog_test.dart
index cc4bddb..ddcdf1b 100644
--- a/test/common/cashier_checkout_dialog_test.dart
+++ b/test/common/cashier_checkout_dialog_test.dart
@@ -153,6 +153,10 @@ void main() {
     await tester.pumpAndSettle();
 
     expect(find.text('库存 2'), findsOneWidget);
+    // 套餐组成默认收起，点击套餐主行展开后才能看到组成明细。
+    expect(find.text('时令青菜'), findsNothing);
+    await tester.tap(find.byKey(const ValueKey('checkout-combo-canteen-1')));
+    await tester.pumpAndSettle();
     expect(find.text('时令青菜'), findsOneWidget);
     expect(find.textContaining('可在支付前调整数量'), findsOneWidget);
     expect(find.textContaining('确认支付').evaluate().single.widget, isA<Text>());
@@ -348,7 +352,8 @@ void main() {
             tester.getTopLeft(cartPane).dy, tester.getTopLeft(paymentPane).dy);
         expect(find.textContaining('x9999'), findsOneWidget);
         expect(find.text('套餐'), findsOneWidget);
-        expect(find.text('清炒时蔬'), findsOneWidget);
+        // 套餐组成默认收起，首次进入不渲染组成行。
+        expect(find.text('清炒时蔬'), findsNothing);
         expect(
           find.byKey(
             const ValueKey('checkout-product-image-long-name-product'),
@@ -357,7 +362,7 @@ void main() {
         );
         expect(
           find.byKey(const ValueKey('checkout-combo-image-combo-child-1')),
-          findsOneWidget,
+          findsNothing,
         );
         expect(find.text('选择支付方式'), findsOneWidget);
         final methodFinders = <Finder>[
@@ -385,10 +390,10 @@ void main() {
 
         await tester.tap(find.text('营养套餐'));
         await tester.pumpAndSettle();
-        expect(find.text('清炒时蔬').hitTestable(), findsNothing);
+        expect(find.text('清炒时蔬').hitTestable(), findsOneWidget);
         await tester.tap(find.text('营养套餐'));
         await tester.pumpAndSettle();
-        expect(find.text('清炒时蔬').hitTestable(), findsOneWidget);
+        expect(find.text('清炒时蔬').hitTestable(), findsNothing);
 
         final wallet = ServiceWallet(
           id: 'wallet-1',
diff --git a/test/pages/terminal/query_method_panel_test.dart b/test/pages/terminal/query_method_panel_test.dart
index 50f7634..b21919c 100644
--- a/test/pages/terminal/query_method_panel_test.dart
+++ b/test/pages/terminal/query_method_panel_test.dart
@@ -26,6 +26,7 @@ void main() {
           autoRecognitionEnabled: false,
           continuousRecognitionEnabled: false,
           quickVerificationEnabled: false,
+          allowManualMealPeriodChange: true,
           onSelect: (method) => selectedMethod = method,
           onStart: () => startCalls++,
         ),
@@ -47,6 +48,7 @@ void main() {
           autoRecognitionEnabled: true,
           continuousRecognitionEnabled: true,
           quickVerificationEnabled: false,
+          allowManualMealPeriodChange: true,
           onSelect: (method) => selectedMethod = method,
           onStart: () => startCalls++,
         ),
@@ -78,6 +80,7 @@ void main() {
           autoRecognitionEnabled: true,
           continuousRecognitionEnabled: true,
           quickVerificationEnabled: false,
+          allowManualMealPeriodChange: true,
           onSelect: (_) {},
           onStart: () {},
         ),
@@ -100,6 +103,7 @@ void main() {
           autoRecognitionEnabled: true,
           continuousRecognitionEnabled: false,
           quickVerificationEnabled: true,
+          allowManualMealPeriodChange: true,
           onSelect: (_) {},
           onStart: () {},
         ),
@@ -139,6 +143,7 @@ void main() {
           autoRecognitionEnabled: false,
           continuousRecognitionEnabled: true,
           quickVerificationEnabled: true,
+          allowManualMealPeriodChange: true,
           onSelect: (_) {},
           onStart: () {},
         ),
@@ -180,6 +185,7 @@ void main() {
           autoRecognitionEnabled: false,
           continuousRecognitionEnabled: true,
           quickVerificationEnabled: true,
+          allowManualMealPeriodChange: true,
           onSelect: (_) {},
           onStart: () {},
         ),
@@ -205,6 +211,7 @@ void main() {
           autoRecognitionEnabled: false,
           continuousRecognitionEnabled: true,
           quickVerificationEnabled: true,
+          allowManualMealPeriodChange: true,
           onSelect: (_) {},
           onStart: () {},
         ),
@@ -226,6 +233,42 @@ void main() {
     );
     expect(tester.takeException(), isNull);
   });
+
+  testWidgets('禁止主动修改餐段时选择器禁用且无法打开餐段菜单', (tester) async {
+    await tester.binding.setSurfaceSize(const Size(1920, 1080));
+    addTearDown(() => tester.binding.setSurfaceSize(null));
+    final mealSlotController = FRadioSelectGroupController<String>(value: '1');
+    addTearDown(mealSlotController.dispose);
+
+    await tester.pumpWidget(
+      _testApp(
+        QueryMethodPanel(
+          methods: ReservationRecognitionMethod.values,
+          selected: ReservationRecognitionMethod.card,
+          status: ReservationMenuQueryStatus.idle,
+          mealSlotController: mealSlotController,
+          autoRecognitionEnabled: false,
+          continuousRecognitionEnabled: true,
+          quickVerificationEnabled: true,
+          allowManualMealPeriodChange: false,
+          onSelect: (_) {},
+          onStart: () {},
+        ),
+      ),
+    );
+
+    final trigger = find.byKey(
+      const ValueKey('reservation-meal-slot-trigger'),
+    );
+    expect(find.text('早餐'), findsOneWidget);
+    expect(tester.widget<FSelectMenuTile<String>>(trigger).enabled, isFalse);
+
+    await tester.tap(trigger);
+    await tester.pumpAndSettle();
+    expect(find.byKey(const ValueKey('meal-slot-option-2')), findsNothing);
+    expect(mealSlotController.value, {'1'});
+    expect(tester.takeException(), isNull);
+  });
 }
 
 /// 构建与终端设计基准一致的主题和尺寸环境，只验证本组件的可见状态与点击链路。