Problem after opening the various screens when screen 1 and click on exit does not work returns to the screen I had previously opened

Help help help! I created a multiscreen, I have a problem after opening the various screens when screen 1 and click on exit does not work returns to the screen I had previously opened. I can't create a button from screen 1 that permanently closes the application. Please help me I have tried every conceivable way but I have not succeeded. Thank you very much for your kindness, Mr. Soave Andrea

Use different screens wisely

If you decided to use different screens, then you should switch them correctly, else you will run out of memory after a while...      
The recommended method of switching screens in App Inventor
(Thanks Taifun)
 
Also see demo: multiscreen.aia