Using 2 monitors in full screen mode with one application spanning both monitors

[Robin Green]

I am running VMWare Horizon in a trusted VM in order to WFH. It is able to detect and use both monitor geometries for what you might call a "double-full screen mode" - however, even though I have enabled full-screen mode for this trusted AppVM in /etc/qubes/guid.conf on dom0, Qubes unfortunately does not recognise what it's doing as "full-screen" and retains the title bar over the virtual window (which spans both screens) and over the Windows Remote Desktop widget (which appears as a separate window fully obscured by the Qubes window title bar, rather than a widget). 

Yes, I am running Remote Desktop, on a remote computer, that I am connecting to with VMWare Horizon, to connect to yet another computer! So many levels of desktop virtualisation here, hehe

If I right-click on the Qubes window title bar and choose Full screen, it of course goes to full screen on only the first display, and no second virtual monitor on the remote computer is accessible to me. If I leave it like it is, I can't see what's at the bottom of any maximised windows on the remote machine - and since I like to maximise all of my windows, this is pretty much unusable for me.

Gonna have to reboot my local machine into Windows for now so that I can use both screens with VMWare Horizon and Remote Desktop, but I would like to figure out a way to get this to work... that doesn't involve manually resizing all the windows on the remote computer!

[redpo...@gmail.com]

 You might have already tried but in dom0 try fn/f8 (or whatever your pc has for display) may give you some more options than going via system>display.  This worked for me when I trying to extend the display rather than mirror.