Just now I decided to start The Sims 4 after not playing it since Jan. 30, 2019. However every time I start the game in fullscreen or windowed fullscreen my screen dims to 0% and I can't use my keyboard to adjust it. But the rest of the game plays just fine and I don't have the brightness problems when I'm playing windowed.
Also when I leave the fullscreen game but keep the window open the screen brightness is normal again. But if I go back to the fullscreen window the screen dims again.
Is there anyway to fix this issue?