In my All feed if there’s a single community apart of a particular instance I can block it and have it filtered out of my feed no problem.

What I can’t do is filter out all of the communities from a single instance. There are some themed instances that I know I do not want to see any posts from any of their communities. Not my cup of tea.

Atm I have to keep blocking their communities one at a time as they trickle into my feed. It would be nice if I could block them all at once based on the instance that they come from.