We apologize for the instability of composr.app and appreciate your patience. We are working on the statistics addon and trying to find an optimal way to store and render data. Unfortunately, we have yet to find a solution that can handle the traffic (and therefore, tens of millions of statistical records) of composr.app. We're working hard on one.
#2253 - Choose which gallery is a part of a member's galleries profile tab
So it should show all a member's galleries, and subgalleries under those. I think that's a reasonable behaviour, and that configuration would be over-complex (at a certain point, one has to make some assumptions, to avoid getting entangled in too many possibilities and settings and complex code - and leave codifying exceptions to addons). If it's not happening as I think it is, please open as a bug.
The galleries tab is the main_personal_galleries_list block. It should show all personal galleries and their subgalleries recursively.
Still, I'll leave the request for configurability here open.