I've got my defaults set to "all" and "active". It's my understanding that "all" shows instances we're federated with, whereas "local" will show only Hexbear posts. I am seeing some non-hexbear posts on "all", but it's mostly Hexbear. Are we simply the most powerful posters and therefore take up the front page or is it weighted behind the scenes to still favor local?
No complaints, I'm enjoying federation so far. Mostly because I'm only seeing posts from other instances talking about how cool we are 
Is there a way to filter Lemmy posts?
If not - I'm going to entirely ignore them. "All" at any site in any forum is never my thing. Filtering is my jam.
---
For weeks I avoided all the posts about federation and I always use my "subscribed" bookmark which gave me no Lemmy posts at all. I didn't even know what was going on until I saw this post.
---
Edit
Maybe this is actually very simple. Do I have this right?...
I can subscribe to whatever Lemmy comms I like.
They'll show up in my "Subscribed" if "Local" is unselected.
we've only been federated for two days
About federation.
If you want to filter, Subscribed is 100% the way to go!
You can still sub to specific comms from other instances and only see those. there might be some of interest at lemmygrad or lemmy.ml
I think if you choose "local" instead of "subscribed" or "all", you'll get only hexbear posts.
Yes, subscribed will show you all of the communities you have joined (or subscribed to), regardless of which instance the community is on.
So yeah, imo, curating your own list of comms that you're subscribed to is the best way to use Lemmy.