DISCUSS: Add switch above comment section to hide/display whole comment section. E.g. a "comment" icon for displaying them and a "comment" and "X" icon superimposed when disabled. Should the system remember this setting (per user/document)? Probably not (yet).
DISCUSS: Do we want to use "more" links instead of inline scrolling? Not just when comments or replies are "too long", but also when there are too many comments on a page. https://baymard.com/blog/inline-scroll-areas. There is already a problem with scrolling in DocViewer (might go to a separate issue): when I scroll pages, the first two pages scroll well, but then focus for scroll falls back to the background page displaying the content list. Adding scrolling here could make this even worse perhaps.