My "fix/workaround" and source of problem on 4K screen was not the general size setting for text etc. at windows 10 'scale and layout' @ 150% (I still keep this setting).
but,
I had also set (use win+u shortcut) ease of access above 100% (usually 124%)...which can be set to anything desired, on the fly.
So, for example, for all programs I use 124% but when using Ps 2021 and I need to use the plugin panels, I must set to 100%, apply, and Ps is all good. I simply change it back to 124% when I'm done with Ps. No restarts needed.
When set at 100% for Ps, all text across windows/programs is a bit too small; otherwise I'd leave it at that setting.
It should not be that way. I don't have to do so in Ps 2020 with same PC hardware, OS, and same 4K screens (I leave 150% and 124% set).
Adobe should fix 2021.
... View more