When one has many features to show in this tiny window, i.e. from big professional database, sometimes it's problematic and takes time to find the one feature class you need. Especially if you see many schemas you need to search through to all of them. If there was a dynamic kind of filter (as a header I guess?) it would be easy to i.e. type the user name to show all tables he particularly owns.
I'am aware that there's a search window, but, in my opinion there wouldn't be a problem if those two functionalities were functioning side by side.