Items in custom folders will not by synced to the user interface. If you have items such as article and eBook records in your custom folders you can use the print, email, save and export tools to export your data. NOTE: in April an option to download the content in your custom folders to CSV will be made available on the new user interface.
Alternatively you can move your items from custom folders to the general system MyFolder for syncing to the dashboard on the new user interfaces.