Update app2.py

app2.py

@@ -105,11 +105,10 @@ def show_previous_content(event):
     if event.obj.name in previous_content:
         main_body_instance.main_body.clear()  # Clear the existing main panel content
         main_body_instance.main_body.extend(previous_content[event.obj.name])  # Add the previous content
-        main_body_instance.param.trigger('main_body')  # Trigger the update manually
     else:
         main_body_instance.main_body.clear()  # Clear the existing main panel content
         main_body_instance.main_body.append(pn.pane.Markdown("No previous content available!"))
-        main_body_instance.param.trigger('main_body')  # Trigger the update manually
+    main_body_instance.param.trigger('main_body')  # Trigger the update manually
 
 # Attach the show_previous_content function to the on_click event of button1 and button3
 button1.on_click(show_previous_content)