How to choose the primary screen with 2 screens?

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1

My laptop is screen # 1 and has been selected as the main display.

However, on my screen 2 is all the desktop apps and so on… How can I change that the entire desktop content remains on my laptop (screen 1; checked for "Use this display as main display") and not always on mine when connected second screen wander.

Many Thanks.

How to choose the primary screen with 2 screens
Sh

Settings -> System -> Display

Select laptop display

scroll down

"Use this display as the main display"