When sharing a report to a user group or public or admin, it is unclear exactly which folder it will show up under, will it show up under all 3 or just one of the 3. It would be nice to have a notification as to which folder it will show up under.

As for how they show up under each group:

Having a tree system for the reports that are shared/are public.

For Admin/Public/Shared workspace having them grouped by User > then Workspace name > then Report Name might be helpful for finding reports. and doing a hierarchy level for those.