by Flag_Hippo » Fri Apr 09, 2021 6:12 am
Simply turning your screen off isn't going to stop it being detected and used by Windows as if it was still turned on (open any window for example and move it to the same boundary - it will not be restricted to the one screen). Therefore you will either need to:
a) Follow the suggestion in my original reply.
b) Turn the other screen on.
c) Tell Windows to use a single screen. Hold down the Windows key on your keyboard and press 'P'. Next select 'PC screen only' or 'Second screen only' depending on which one you want.
d) Disconnect the monitor.
e) There may be other options with regards to monitor detection but that will depend on the specifics of your setup such as graphics card/manufacturer, display cable type e.t.c.