Split room list by subspace

This is what a regular room list looks like in Discord:


After trying to bridge some Discord communities, their members complain that the room list looks disorganized in Element because the rooms are not thematically organized (like in the screenshot; where there are Info, Support, Conversation and Gaming categories) and instead there is a single list, containing unrelated rooms.

Instead, the room list could be grouped by subspace like this:


I think this would make it more manageable, and that it would make rooms easier to find.