Tree View | All schema is displaying all users instead of all schema. If a user does not own any objects, they are just a user. It would make more sense if the "All Schemas" list only listed the owners of objects. If a databases with over 1,000 users and only 37 that own objects, it is a waste of time scrolling through all of the user names that do not own objects.
An enhancement Request has been submitted to Development for future release.