Lenovo legion hdr issue with external monitor

I was trying to fix a handshaking issue that my monitor was having with my Lenovo legion laptop. I flipped on the hdr setting and immediately both screens went black. Now whenever that monitor is plugged in I get a black screen and both screens are unusable. How can I turn hdr off for that monitor without having it plugged in. It is the only display I use. I am losing my mind.