On version 0.19 you can block instances so that you don’t see any posts from that instance, instead of having to block communities one by one, you still see comments from users of that instance in other posts so it isn’t completely blocking the instance.
Honestly, I’m not sure. You can make a thread in the lemmy support sub if you want, someone will probably answer pretty quick.
This comment might not get seen much, since this post is from yesterday I think.