Code Quality: Fixed COMException with WinUI Desktop Window (#15638)

Co-authored-by: hishitetsu <[email protected]>

Author: yaira2

src/Files.App/Views/ShellPanesPage.xaml.cs

@@ -47,7 +47,19 @@ public bool IsMultiPaneActive
 			=> GetPaneCount() > 1;
 
 		public bool IsMultiPaneEnabled
-			=> !AppModel.IsMainWindowClosed && MainWindow.Instance.Bounds.Width > Constants.UI.MultiplePaneWidthThreshold;
+		{
+			get
+			{
+				try
+				{
+					return !AppModel.IsMainWindowClosed && MainWindow.Instance.Bounds.Width > Constants.UI.MultiplePaneWidthThreshold;
+				}
+				catch
+				{
+					return false;
+				}
+			}
+		}
 
 		public IShellPage ActivePaneOrColumn
 		{