The entry for FullscreenMode options found here, mentions a WindowedMirror option.
I could not find the console command for it but made a guess at: r.SetRes 800x600wm
Upon testing I can confirm that it does change the fullscreen mode from previous settings, suggesting I correctly guessed the command.(my understanding is the mode will not change if you don’t input a mode suffix after the resolution) However, for all appearances it seems to just act as a regular Windowed option?
Did I guess wrong and its just a regular Windowed change?
What does it do exactly?