Windows 10 - Games load on Wrong Monitor

[Mirith]

After a recent windows 10 update (Week of Dec 10, 2017), I started noticing some of the games I load out of steam wouldn't open up on the correct monitor. I run two, one in landscape mode and one in portrait mode (Vertical). The landscape mode one is my "Primary" monitor according to windows, and it is where I expect my games to load. However, now they load on the vertical monitor. I cannot fix it, and because they are on the vertical monitor, the last few games I tried had the resolution values reversed to reflect it being on vertical. Because of this I can't really drag it to the horizontal monitor, since it isn't the size, and often times it doesn't display the game correctly.

Any help on how I can fix this?

[Bad 💀 Motha]

Wipe out GPU Drivers and redo them correctly.
Then setup your Monitors once again.

Doesn't really matter what screen something launches on, just move it over or go to game options and tell it which Display u want it on.

[Pickles]

Or just turn off the other monitor

[LiMpY]

Mirth are you saying if you right click on desktop, select display settings, click on your preferred monitor and scroll to the bottom and check "make this my main display" doesn't work?

[Mirith]

Turns out it was the Fall Creators update for Windows 10. Reverting it fixed it.

[Bad 💀 Motha]

Nothing wrong with that update; you need to redo all your Drivers and Displays and you'll be fine.