I have a zellij snd micro config for journaling and writing that makes a completely borderless full screen terminal with no decoration whatsoever and narrows the terminal for micro to the upper half of the middle 1/3 of my screen.
It helps me focus and limiting to the upper half and middle 1/3 makes it easier for my eyes. I get distracted easily and this helps keep my editor from being the source of that.
It has to do with muxing for the dGPU. I have bashed my head against this what seems like endlessly. My suggestion is that you should enable only dedicated gpu mode in your bios. That has worked for me. It kind of sucks because you feel like you are leaving performance on the table, but I have found nothing that works properly on any DE in any configuration.
At the end of the day it is basically a hardware issue, and for your specific hardware it will not work. I’m my limited opinion.