When using send and file mail, a pop up box is presented with the folder structure of the user.
The whole folder structure is open, and having many folders and sub folders makes it time consuming to browse down to the one needed to file the new mail. Also closing folders to get the folder structure less long, is also time consuming.
It would be much faster to file the mail if the folder structure tree were closed, and the user instead could open the part of the folder structure needed.
Wayne Gibbons has commented on this: I had a look at the @Picklist function (which is the function which that button is calling) and there didn't seem to be any documented option to control that.