On the Windows version of Scrivener, the binder uses a little “>” for the folders. The resulting indent seems to be very small compared to what you get on the Mac version, which seems to be a whole icon width and lines up better. It might be a good idea to indent that a bit more and possibly use a larger symbol than “>” to make navigation a little easier.
This can be added in the following versions without much overhead. I have filed a ticket with this request[LH #2736] and we will do our best to make it happen within the following releases.