To check your display resolution on Windows, you can go to display settings. If the tab key never finds a setting to adjust display resolution, that means there's only one choice, which is often a sign that your resolution is locked to 480P. You can use screen reader review commands to check it. It's right after the "Scale" option.
I solve this by buying an "HDMI dummy plug", which is a tiny device that plugs into the HDMI port and pretends it's a real monitor. Many of them support more than one resolution--mine goes all the way to 4K, though that causes noticeable lag on older hardware so I always keep it at 1080P.
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