Must have over read,
The thing i noticed sometime is when playing on single screen it looks like it is out of screen boundaries and seemed overscanned, and it looks like i only get a 1/4 of a page,
So that why i think related to desktop settings, and not so much of sim settings.
For me alt enter works fine if pressed 2 times to fill the screen as normal but for you
It is a hazard, unfortunatly i can not be off assistance in this matter, but i hope you get it fixed.
Regards