Folder structure between Folders and Sub-Folders
The display of sub-folders within the folders of the individual e-mail addresses is very confusing. Folders and subfolders are currently displayed equally, so that while scrolling (and a large number of sub-folders) you can not see at a glance which folder you are currently in. It might help to highlight the folder or even clearly show a folder structure or that sub-folders are engaged only when clicking on a folder.
iChris shared this idea
same problem with individual accounts :(