Commenting using dual high- and low-res monitors
Opening multiple Acrobat windows on separate displays causes problems with the resolution calculation in the comments panel, if the screen scaling is different for the two screens.
I'm using the latest release version of Windows 10 Professional, and one panel is 3840 x 2160 at 150% scaling, and the other is 1920 x 1080 at 100% scaling. Acrobat is Acrobat Pro DC 2020.006.20042.
Ordinarily Acrobat rescales correctly as you move windows between screens, but the comments panel seems to have an application-wide display scaling (unlike the rest of the UI) and whichever screen you use most recently ALSO changes the scaling in the window on the other screen, if you have multiple windows open. E.g. if I switch to the lower-res monitor, all the comments in the panel on my other screen are suddenly tiny. The attached picture shows the tiny comment panel text.
This happens in reverse too - use the panel on the high-res screen and I suddenly have giant text on the low-res comments panel.