Oh! That’s interesting. Thanks for clearing that up. :)
The All Feed shows you all communities from all instances. Whether you are subscribed to them or not.
The Local Feed shows you all communities from your instance. Whether you are subscribed to them or not.
The Home Feed shows you only communities you are subscribed to. This includes any communities you follow that are located in other instances.
New apps every week! lol
They’re just like us :D