How to revert xserver virtual monitor ?

I found some solution , to have virtual display (so I can use rustdesk remotely), but apparently it causes issues with real monitor not working.

I want to revert this, so real monitor can work again.

Or is there some other solution, where I can have real monitor and virtual monitor (for rustdesk, and when real monitor is disconected)

There's some guides, but they touch on so many config files, and with this linked post, I got confused, and don't know how to revert to real monitor.