not optimum mode recommended mode 1920x1080 60hz… how do I fix this? The monitor doesn’t...

It’s a Samsung 390 series 24 inch led free sync monitor

I’m just trying to get the Xbox to show up in the hdmi input it won’t work with the monitor and doesn’t let me switch modes

What model of monitor is it? What mode are you trying to change it to?

That’s all it’s saying, does this mean i can’t use it

Many monitors cannot sync with Xbox becaus they violate the worldwide VESA standard to achieve their specs

You should contact support for your monitor to find out how to change modes and see if it works.

If you are using a monitor, most of them rely in compute assistance to produce their nonstandard timings. If you didn't pay at least $500, it's almost certainly not goi g to do 120hz because monitors use very basic electronics and scalers internally