If I find a community I don't want to see in my feed, I add it to the filtered community list, refresh, and it'll reappear along with others on the list. Anyone else having this issue? Read in another post about filtering users, you'd have to add the entire domain.
Sync now supports "blocking" communities, which tells Lemmy that you don't want to see that content. Much more effective than filtering because it also transfers to the site, so desktop will reflect the blocks.