For instance, how to keep subbed comms. from flooding my home feed, like I'm seeing with Technology, or how to create Groups of communities, although maybe that's more a question for the app I'm using, and there's already a comty by the dev.

...it uses the %20% character sequence instead of the domain suffix dot (I think) which doesn't resolve to any site. Please kindly correct this small bug to help less technical users, thank you ! EDIT: this was when first adding my account, I've added the page for reference. I could not reproduce it now, so I'll update if I find it again.