Blacken screen feature as in anydesk and teamviewer to protect privacy!

[Evolgate]

Is your feature request related to a problem? Please describe.
It is quite clear from the title, this would be perfect for the remote session viewer

Describe the solution you'd like
A button in the remote session viewer to hide the screen so the user does not see what I do

Additional context
](https://www.youtube.com/watch?v=dUAJZssyHqc)

[edcdecl]

you need to install a video driver to do that, and seeing how there's very slow development going on, this is probably never gonna be implemented