That would probably be because a window in the foreground prevents fullscreen unredirect from being used.
I suggest if you need both fullscreen window support and fractional scaling then logging into "Ubuntu on Wayland" might be a better option right now.
That would probably be because a window in the foreground prevents fullscreen unredirect from being used.
I suggest if you need both fullscreen window support and fractional scaling then logging into "Ubuntu on Wayland" might be a better option right now.