how do I turn off screen mirroring by keyboard?

Loren Miller1 wrote:

how do I turn off screen mirroring?

What about Control Center...

From the keyboard — see if you can add as a Quick Action...(?) You can then add this to Touchbar/Control Strip

re: Use Quick Action workflows on Mac - Apple Support

Command-F1 is the standard keyboard shortcut to toggle between mirroring and extending desktop.