Hello folks,
Please see this earlier post from my colleague @Chewwy94:
This bug has been logged internally and confirmed to be occurring on both the regular release and SU_15 beta builds. A fix for this will be coming in SU_15. In the meantime, the quick workaround is to press Alt+Enter to return from windowed to fullscreen mode.
It is not necessary to post additional “I’m getting this too” comments.
Thanks,
MSFS Team