So, I think I found a way.

Go to your subbed communities or filters (the list of subscribed stuff, next to the home button.

Tap on your instance. Change to ‘about’ It shows trending communities. At the bottom, there’s a ‘See all’ button.

There should be a simpler aay to get to it, but I’ve no idea how to design it, so I can’t offer suggestions

Beyond that, if you just want a list of local post feed, that’s available at the top of the home feed, you can select all, subscribed or local from instances you’ve added to lemmy.