Congrats on being able to move finally!

Tried couple of things - I got it to do that as well when I changed the "Input EDID Mode" to "Merged", which seemed to be the Default setting.

Could you clarify that your "Input EDID Mode" is set to "Display" - mine seemed to maintain the set resolution if it's set.
Also Make sure to Hit "Apply"!

One last little extra thing as part of this thread - if you want to try streaming your game capture to Discord and don't want to stream the capture utility, you should be able to select the Capture Card under the "Devices" tab.

Make sure you set the Audio device for the stream/screen share as well.

You might be okay as long as your set the Format to record at 4k - although this might the capture software up-scaling it,
Since think the Switch 2 will still rendering at 1080p.

Not sure if you can have the Switch render at 4k, then have your Elgato pass a 1080p signal to your monitor.

Let me try

Yes you should be able to. If you are using the 4k Capture Utility software, there should be a way to set it to use the "EDID" of the monitor, or force it to use a 1080p signal.
Look in the settings under the Device Tab and at the "EDID Internal". Also trying seeting "Input EDID" to "Display

my cat keeps sitting on my lap between transfer instructions so it’s taking longer than it should 🥲

"I will end you!"

Boat go-