Problem with external display

[Windows 10]

Hi,I set up an external display via HDMI from my laptop. This was working fine, but I wanted to turn off the "duplicate" feature. This worked great and I was only seeing a screen via the external display. As a test, I toggled on HDR but now the external display no longer has a signal. To complicate matters, I can't view my laptop screen with the HDMI connected as it is not mirrored anymore, I only see black screens and therefore cannot change any features. When I remove the HDMI, my laptop screen comes back but I cannot access the settings I need for Display 2 to turn off the HDR. How do I get

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