When blocking communities, they will not show up in your “all” feed anymore. This makes browsing Lemmy nicer especially now that you might not subscribed to a lot of communities.
In the browser: In you Lemmy instance, click on your username (right upper corner), “Settings” and open the tab “Blocks” and type in the community you would like to block. Here you can also unblock communities
On Jerboa (Android): Open the community you would like to block, click on the 3 dotted menu (right upper corner) and click “Block Community”. Note: you can not unblock on Jerboa. Use the browser (Settings -> Blocks) to unblock.
I’m on kbin and there is a way to do this on the desktop site at least. If I click on the domain it goes to a page viewing it with a block button. Maybe what you’re using has something similar?
I don’t think so, no. It is being talked a lot about Lemmy users that there’s no such option so far. Good to know kbin has it, tho. I really liked its UI