Hold down the ALT key while clicking on a folder to expand or collapse all folders in the folder tree.
In Bookmarks, Notes and Mail you can have content divided into multiple levels of folders, creating a so called folder tree.
To expand or collapse all folders in the folder tree in one go:
- Hold down the ALT key on your keyboard.
- Click on the
/ 
arrow in front of the folder name to expand or collapse the main folder and all its subfolders.
