If you can get to the launcher screen that is where you adjust the launcher settings.There is an options tab on the launcher.
It is a seprate program from the game.
If you can get to the game then you black screen try Alt + Enter as that is the shortcut.
If that doesn't work then you botched your settings and you should just start with a fresh install.
Also when you want to switch back and forth from win to FS use alt + enter. Not alt tab.
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