Can you tell how to use task extension to make screen run in background.

MIT App Inventor Help
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1

Can you tell how to use task extension to make screen run in background.

2

i also want to know this.

3

A screen can't run in the background...
If your app is in the background, there is no user interface available, so everything which is visible like labels, textboxes etc will not work

For examples what can be done see

Taifun