I'm new too but this is how I understand it. When looking at communities click on the ALL tab not local... That shows all communities that, that instance knows about (which includes communities on other servers like ttrpg.network) If you do it on a large server like lemmy.world then your pretty much searching the whole fediverse
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I'm aware of this, but I'd love a way to only browse specific other instances as if local. That way you could narrow your browsing to a topic if an instance is specifically for that topic. For example if there was an instance just for gaming, another just for sports etc. you could switch between different topics and narrow your browsing to only show communities for that instance's topic, depending what you're in the mood for and to discover new communities.
It seems like instances focused on certain topics are a logical way for the fediverse to work.