by csnizik » Wed Dec 22, 2021 6:57 pm
I found this when I was experiencing the same problem, and I finally figured out a solution. Hopefully this will work for you too:
Go to System Preferences > Displays > Arrangement and relocate the menu bar from the laptop to whichever display you're trying to run FlightGear on. (You relocate the menu bar by grabbing the white strip that is across the top of one of the displays and dragging it onto another display.) Then I had to go into my preferences.xml file and change the <screen> from 1 to 0, since screen 0 is now the external monitor I'm trying to use. When I relaunched FlightGear, it was displaying on the correct monitor and when I hit TAB to cycle through mouse modes, the cursor remained on the correct monitor.