Hello, I have a 3-monitor setup using 2 external monitors in addition to the primary display on my monitor. I have the external monitors side by side, with the primary laptop display centered below them. When I try to make anything full-screen in the external monitors they appear to only expand to the top left or right corner of the primary display instead of spanning the entire screen. Attached is a screenshot of the issue I am having, with Opera "full-screen" in the upper-left display.
If you can't fix it via the settings -> display, install arandr .. it give you some options If you are using proprietary drivers: nvidia drivers e.g. comes with an own configuration utiltiy
