Ah, I wasn’t fully understanding, I see what you’re saying now. There’s no way to know the number of comments on a single level/depth as of now without some extra fetching. I think your best bet at this point would be preloading the next page of comments on the top level, and if no comments are return you then know not to show the “load more” button.

Then, each time the next page of top-level comments is fetched, you can also fetch the children of each comment. This will prevent unwanted layout shift and ensure all children are fetched. If you don’t do this, I’ve noticed sometimes child comments go missing when I try to fetch multiple levels of comments in one request from a larger comment tree (100+ comments)