As a Student, I use GoodNotes every day. So it‘s normal for me, that I have to use the double window mode. But this is a little bit problematic, if the two windows are the same document. It happens very often, that I have to copy some things from one to the other window, and like this that makes things complicated. You have to do so many things, just to copy something.
If there would be the opportunity to have two sides, next to next, in one window (provided that it’s the same document), i would be way easier to handle.
(For example please look at the files)