Why can't I close my app?

MIT App Inventor Help
2

This can happen if you open a Screen more than once.
See here: App Inventor Tutorials and Examples: Manager Screen | Pura Vida Apps

For example:

grafik
grafik1768×348 124 KB

5 Likes
Exit block not working
Create a block to close the application
Same screens were overlapped when press device back button
About Screen Layout