Thanks for sharing this! My main issue with the windowed projectors is that you can't force them to have the proper size for the resolution of the OBS canvas which causes the result to be scaled and it has window borders. I've worked around this by having a virtual display (in my case BetterDisplay [1], but DeskPad should work as well) and use the full-screen projector instead, as an added benefit there is no additional window floating around. The resolutions are all aligned, so no scaling.
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[1] https://betterdisplay.pro/