Turn off phone display and force horizonal orientation while external monitor is connected

I’ve just connected my SGS10 to external display.
For now it just mirrors the screen, which is fine for the beginning.

that would be great if it was possible to have a toggle to turn off phone display + horizontal orientation force in such a case.

Regain your privacy! Adopt /e/ the unGoogled mobile OS and online servicesphone

Maybe…

Developer Options → force desktop mode