Can't Get Fullscreen On HVM (Ubuntu Mate)

Hello Everyone,
Hope Everyone Have A Great Day I Have Installed
Ubuntu Mate As HVM So Installed It and everything is okay but the screen isn’t goes Fullscreen

I try change the file

Sudo /etc/qubes/guid.conf

global: {
  # default values
  allow_fullscreen = true;
  #allow_utf8_titles = false;
  #secure_copy_sequence = "Ctrl-Shift-c";
  #secure_paste_sequence = "Ctrl-Shift-v";
  #windows_count_limit = 500;
};

But i can’t get Fullscreen ?!

Did i do something Wrong!?

Ubuntu Mate As HVM So Installed It and everything is okay but the
screen isn’t goes Fullscreen

Right now your HVM in in a window. Right-click on the window title and
select “Fullscreen”

If you want to get out of fullscreen type Alt+Space and choose “Leave
Fullscreen”

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When i try this nothing happen it’s stay just like that

Jup!
Same here. Never got this feature running. Always have my HVMs on 1920x1080 max (on a 4K screen for Laptop or extended display).

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When i try this nothing happen it’s stay just like that

This used to work, but has stopped working for me too I just realized.

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Thank You I try with Today but No success At All

I also have this trouble in the standard fedora VM (personal)

I try and make firefox full screen but nothing happens or it crashes.

The same if I try to make youtube videos go full screen.

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