Folder sorting option
In the Folders screen, you can now assign a "sort priority" to each folder.
When viewing on the mailbox screen, subfolders will still be grouped together under the parent, but within that parent, they will be sorted by the new "sort priority" field. This applies on the top level as well.
This allows you to customise the order of folders in the folder list, so that you can have your most commonly used folders near the top.