Tap on a comment and it and the comments below it could collapse. Possibly have a colour to highlight collapsed comments. Maybe not the highest priority, but it would add some luxury. ππ
This is improved in 0.0.33. Now it's just tap anywhere on the comment that isn't also a button. There's a setting to configure if you want that comment to collapse or just the replies.
You'll get more frequent updates with the IzzyOnDroid repository: https://apt.izzysoft.de/fdroid/repo?fingerprint=3bf0d6abfeae2f401707b6d966be743bf0eee49c2561b9ba39073711f628937a
v.0.0.33 just went live, i see! :-)
... and indeed, i can tap to collapse anywhere. Font sizes are fixed ... Just some things still not al the way satisfying, will have to file another bug: a collapsed subthread all the way at the bottom can not be opened again. And it would be nice to still have some context visible on a collapsed comment, perhaps truncated and in small font.
I'm using the F-Droid version as well. Make sure you've updated to the latest because this is a new feature that was just pushed out.
Edit: as others have said, there is no icon, just click on the comment. If you need to copy a comment you'll need to click on the comment options and then "View Source".