when browsing through folders each folder can be expanded by selecting the "+", if there are no more sub folder then there is no "+".
This is correct for local drives but network drives always have a "+" on the folder even when there is no more sub folders.
examples
Local drive ...

Network drive ...

if there are no sub folders then there should be no indication that there is. At worst the "+" should disappear when the folder is selected and the browser finds there is no more sub folders.
This happens in versions 1.82.4 and 1.90 beta 3.
Thanks