I've found a KVM switch to be invaluable for things like ... as "8K@60Hz" with "HDR", the KVM doesn't support 3440x1440@144Hz/10-bit HDR, with the screen occasionally blanking in this mode.

Also, check that your monitor is connected via a capable cable (like DisplayPort or a high-speed HDMI). Lastly, update the graphics settings in your operating system to enable 144Hz. To enable ...