My mouse isn't locking to my dbd window

I was playing DBD today, I mainly play killer and when I would turn my cursor would still appear. I play on steam on pc so when I move my mouse my cursor would appear on my second monitor, and when I'd try to attack then it would just focus my tab on my second screen and tab me out of DBD. I've tried changing my graphics off of full screen and back on and it didn't help, tried using other modes it didn't help, tried verifying my game files and it didn't help, and tried using a launch option that I saw online which was just "-lockMouse" which didn't help either. Can someone help pls

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