How to switch screens correctly

Guides
#1

I see many issues done by users because they switched screens not correct.

This below is now just one of many other solutions:
blocks

If you dont open/close screens correct your app will get possible runtime errors.

Possible errors: (example)

Unable to add window -- token android.os.BinderProxy@45d459c0 is not valid; is your activity running?

Iam sure you don’t want that.

Then please do it in the future and switch screens correct.

General Tips and Tricks for App Inventor/Makeroid

The recommended method of switching screens in App Inventor
https://puravidaapps.com/manager.php

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#2