The Table of Contents feature is a menu available on all platforms that allows the user to access the tablet of contents wherever they are in the publication.
To populate the menu, go to Settings > TOC and simply select the relevant page label from the dropdown, enter a description for that menu item and then click Add. Repeat these steps for each item in the table of contents menu.
Note: Users can sort by the page label or the description alphabetically by selecting the require radio button.
After the changes have been made, regenerate the preview link to see the table of contents menu in action: