What is the procedure to refresh the folder list under the Inbox?

Please crick the sync icon with the following steps and then the folder list will be refreshed.

- Nine Settings > Your account > Click the sync icon on top toolbar

If you still can't see new added folder on Nine, please click on the folder icon and the folder will be expanded.

Nine supports the collapsible folders.

If you see the folder icon carefully which has the sub folders, you can see the arrow icon.

Please click on the left area of the folder icon and you can control more easily to collapse/expand the folder.