Can't change resolution on external monitor

I just set up my UD-3900 system through a Lenovo laptop with one external Sceptre monitor. Two issues:

I want the Sceptre monitor to be my primary display, and I can’t figure out how to change it. I know where the settings are but it greys out the option.

And, the resolution is funky on this Sceptre monitor, presumable because of the same issue. If I can make it my primary display, will I be able to adjust my resolution? Thanks

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