Click on the closed book icon
to open that level of the table of contents. Click on the open book icon
to close that level of the table of contents. You can open or close the entire table of contents through the similar buttons at the top of the tab. If an entry in the table of contents links to a topic, the icons associated with that level have an arrow on the book icons:
and
. Click on the table of contents title to display the associated topic.