The chevron/arrow UI is typically used when something can be expanded and collapsed. In the desktop app, the folders have a chevron but they cannot be expanded. This creates confusion.
I propose using a folder icon the way the iOS app does.
@watsoncj Believe it or not: I wanted to report the same issue here but I found your topic.
@kspearrin The icon should be changed to a folder icon because it implies a collapse functionality that is not existing (#Usability, #UX)