Toggle between two screens

Desktop Environments Gnome
6

Not so easy, but works for me.
ydotool setup

Relative mouse movements (absolute would have been better, but it failed for me)

#!/bin/bash

TOGGLE=$HOME/.toggle

if [ ! -e $TOGGLE ]; then
    touch $TOGGLE
    ydotool mousemove -- 0 -800
else
    rm $TOGGLE
    ydotool mousemove -- 0 800
fi