If a Windows 11 laptop with a 15" or 16" 4K screen is setup for readable apps, what happens when the laptop is connected to a free standing 27" 2K or 2560x1440 monitor via display port?
There is a two way communication and the monitor reports what resolution it is capable of, and the laptop outputs that, and gives you the option of other lower resolutions to set as well.
If you're just mirroring outputs, windows scales the image, that works for both upscaling and downscaling. I had a 1440p monitor running at '4k' because I was mirroring to it from a 4k main display, looked bad but it was kinda neat.
If you extend the displays windows treats every monitor as its own desktop and it gets its own scaling regime.
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