Citra Android shortcut switch screen in 3DS?


I like to use screen full screen and so turn my phone and see only main screen.
But sometime need to switch other screen, the think are I plan to play on my TV and not got the phone close to me, so cannot easily switch between screen sometime when this is need it.

I found solution for Citra on computer how made keyboard shortcut and assign to a key of the controler, but I cannot find any solution for Android, maybe don’t search well but this is why I’m asking the help of the community, anyone know how do that ?

Thank you very much in advance