When I'm entering a comment on a proof, the box that opens is tiny and can't be expanded. I only see three lines of my writing.
This makes edting a comment very tedious. The scroll bars are useless—one tiny move of the mouse rockets you to the top or bottom of the comment, so accessing something in the middle is harder than it needs to be. I may as well be doing it on my phone.
Making the comment box expandable (like this comment box) would fix this problem.