Wrtier/Web is the inbuilt HTML editor of LibreOffice, with HTML as default file format. And because HTML doesn't support Comment boxes, when you edit or save a document (in HTML format), the comments would get lost, so they are disabled.

Thanks for explaining the difference between viewing a Writer Text Doc as "Web" vs a document saved in the Writer/Web format.

I often start a new LO Writer Text document to take notes during a webinar. Thus I need a small LO window on the side of the webinar window- just big enough to type into, and it needs to wrap the words to the window size. I will later view and work on that document as "Normal" view, but my new docs usually need to start with window wrapping enabled so I can use LO as a narrow window alongside the webinar.

This Solution to set up a doc for Web view (View menu-> Web) and save as a Template (File menu->Templates->Save As Template...) then mark it as the Default for new documents is very helpful, and exactly what I need. Perfect! Now all my new LOW Text docs start life in Web view. It's working well so far. Saves me from the repetitive behavior of needing to separately set up several documents every day. Thank you.