I think (!), This is suboptimal wording. Basically, you select what account it will use to do a search. And definitely to do a search the app will connect to the corresponding instance using your account

I think this is a limitation of Lemmy. There is no one single Lemmy. Each instance talks to a set of other instances and has their own block list. Things you can find on one instance might not available on another one

It would be nice to have similiar search as: https://lemmyverse.net/communities