You can long tap on the username of the thread you want to hide. It was not the most intuitive thing for me but I found it accidentally and maybe I can save you from the searching!
That behavior is about to change. There’s already a jerboa update available that changes the thread-hiding trigger from long-tap on the comment header to regular-tap on the comment body (away from links and other tappable bits of the comment).
This update is available on f-droid now, but only came out yesterday I think. Might not be on the play store yet, but get ready for this to change on you.
Hahaha just tried to do it the way OP said and figured out the changed it lol. Then I read your comment… should have kept reading before spending 2min wondering why it wasn’t working.
Play store already had that behavior from at least the previous version, and just got the changed inbox behavior this morning. They’re keeping parity between them pretty well.
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Copied from another explanation: >use your search feature on your main instance and enter !{community_name}@{instance_url} then you can subscribe
So for example if you want to sub to the memes community in lemmy.ml then go to Search, type in “!memes@lemmy.ml”, under Search change the dropdown from Communities to All (important step), then you should see the community which you can subscribe and post to.
Edit: added image for better understanding.
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https://tech.michaelaltfield.net/2023/06/11/lemmy-migration-find-subreddits-communities/
This post was a great start in my opinion. You can read about the ways to find communities there across all instances.
The main way that most seem to do it (it is also written about in the article) is using this site https://browse.feddit.de/
