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Black screen when screen mirroring - but not like everyone else is experiencing

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I'm trying to use two screens so I can work with YouTube playing on the secondary screen. It works fine until I switch YouTube to full screen. It does fill the secondary screen fine and the video plays, but then my main screen goes black. I can swipe the screen and that brings back my main screen, but then it puts the black screen on my secondary screen. The best way I can explain it is that there seems to be a third screen option (let's call it screen two) that's completely black that's in between the main screen (screen one) and secondary screen (screen three). I can have screen one and two or two and three, but not one and three.

Any suggestions?

I'm trying to use two screens so I can work with YouTube playing on the secondary screen. It works fine until I switch YouTube to full screen. It does fill the secondary screen fine and the video plays, but then my main screen goes black. I can swipe the screen and that brings back my main screen, but then it puts the black screen on my secondary screen. The best way I can explain it is that there seems to be a third screen option (let's call it screen two) that's completely black that's in between the main screen (screen one) and secondary screen (screen three). I can have screen one and two or two and three, but not one and three. Any suggestions?

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