Thank you! That solves the problem!
Though, I coudn’t disconnect the monitor using the 5th option. That didn’t work for some reason.
What I had to do is use
xrandr and execute the following to disable that broken display:
xrandr --output LVDS1 --off
So I added the following line to my
.i3/config to execute the command on startup:
exec --no-startup-id "xrandr --output LVDS1 --off"