Thus I am stuck with this bad program (or switch to an alternative). Unfortunately older version, which were much better, crash these days. With this (and not only this) Adobe Acrobat Reader DC Adobe has certainly made no progress. Requiring everyone to cumbersomely switch first to the Tools and there to the Comments Tools before one may notice that a PDF contains some comments is just silly in these times where everyone has to work under high time pressure. With Acrobat Reader DC they gone from one extreme to the other. And then I believe they should make that icon bigger by default. What Adobe should do at least is offer a preference setting where the size of the icon can be made bigger. This is the issue, not the font size or other preferences in terms of the comment once that comment pop-up window is open. The icon shown while the comment is closed needs to be bigger and more conspicuous.
I already had colleagues who thought I had not commented a PDF at all, while it was full of comments. This basically hides the comments I have added to a document.
1.361316) shows in any freshly opened PDF document only tiny little dots not visible unless you know it is there. We have to say, the removal of the font feature to change its size is a strange one. The problem is that Adobe Acrobat DC (e.g. You had to open Sticky Notes > 3-dots > Settings and then slide the slider, under Enable insights. The labe 'Correct Answer' is inadequate in my view. This answer is not addressing the issue at all.