UI Help Searching for communities in an instance

Forgive me if I'm confusing some terminology. Haven't been in the Fediverse long at all. I'm still having trouble finding specific communities on Lemmy. I found a Green Bay Packers instance called: Packers@fanaticus.social which is sadly not that active but what if I want to find other NFL teams within the same instance because it seems like it would skew towards more sports related content.

How can I search for other communities within fanaticus.social in the search bar? I've tried on browser and iOS (wefwef) with no results

Thanks for the help and apologies if this is a newbie question