diff --git a/Ink Canvas/Helpers/PPTUIManager.cs b/Ink Canvas/Helpers/PPTUIManager.cs
index 718c1ef1..dc5c2b86 100644
--- a/Ink Canvas/Helpers/PPTUIManager.cs	
+++ b/Ink Canvas/Helpers/PPTUIManager.cs	
@@ -99,6 +99,8 @@ namespace Ink_Canvas.Helpers
                         UpdateNavigationButtonStyles();
                         if (MainWindow.Settings.Advanced.IsEnableAvoidFullScreenHelper)
                         {
+                            // 设置为画板模式，允许全屏操作
+                            AvoidFullScreenHelper.SetBoardMode(true);
                             _dispatcher.BeginInvoke(new Action(() =>
                             {
                                 MainWindow.MoveWindow(new WindowInteropHelper(_mainWindow).Handle, 0, 0,
@@ -114,11 +116,16 @@ namespace Ink_Canvas.Helpers
                         HideAllNavigationPanels();
                         if (MainWindow.Settings.Advanced.IsEnableAvoidFullScreenHelper)
                         {
+                            // 恢复为非画板模式，重新启用全屏限制
+                            AvoidFullScreenHelper.SetBoardMode(false);
+                            
                             _dispatcher.BeginInvoke(new Action(() =>
                             {
-                                MainWindow.MoveWindow(new WindowInteropHelper(_mainWindow).Handle, 0, 0,
-                                    System.Windows.Forms.Screen.PrimaryScreen.Bounds.Width, 
-                                    System.Windows.Forms.Screen.PrimaryScreen.Bounds.Height, true);
+                                // 退出PPT放映模式，恢复到工作区域大小
+                                var workingArea = System.Windows.Forms.Screen.PrimaryScreen.WorkingArea;
+                                MainWindow.MoveWindow(new WindowInteropHelper(_mainWindow).Handle, 
+                                    workingArea.X, workingArea.Y,
+                                    workingArea.Width, workingArea.Height, true);
                             }), DispatcherPriority.ApplicationIdle);
                         }
                     }