You can do this with /api/v3/community/hide, or in the database by setting community.hidden. Unfortunately this is not available from lemmy-ui yet.
From a comment by nutomic: https://lemmy.ml/comment/16090216
Context: https://lemmy.ca/comment/13891923
Not sure if that feature was known to everyone, so sharing this as its own post.
Will it hide them from other instances All feed? Because that’s where usually the main problem posters come from.
Not sure, I feel like the use case here is more to hide remote communities from your local users, not the other way around
@nutomic@lemmy.ml ?