Update app2.py

app2.py

@@ -67,6 +67,9 @@ def toggle_settings(event):
 
 button4.param.watch(toggle_settings, 'value')
 
+# Variable to store the content of main_panel
+main_panel_content = None
+
 # Function to reset the main panel content to the initial content
 def reset_main_panel(event):
     global main_panel_content