Fortnite screen distorted?

I have the problem that when I start Fortnite the whole screen is distorted. When I do something, the picture immediately turns black and you have to press the Windows key several times to see something again.

I hope you can help me.

Go to the settings in the game and adjust the resolution.

Is that only in Fortnite?

The problem is that when I press the settings, the screen goes black

Yes

Then you should have a look in the Fortnite settings. Otherwise I don't know

YES

If you don't get in there then reinstall.

Then pull your monitor until it fits!