Where do all the posts from "All" instead of "Local" come from?
I'm still getting my head around logistics. If I view "Local", that's only posts from Beehaw. If I go to "All", do those posts come from every instance that Beehaw is federated with?
Is there a way to see every instance that Beehaw is federated with?
You're correct about the difference between Local and All!
You can see the full list of Beehaw's Connected and Blocked instances here. A that URL format works for any Lemmy instance, https://<instance domain>/instances.
Note : it's a bit more restrictive than every instance we federate with, it's actually every community where at least one person from Beehaw subscribes that we federate with.