You can select a custom font for displaying book and page titles and can create a 3D look for the ToC. You can also add ToC and index controls for better navigation.
Right-click on a layout for HTML Help output in the Single Source Layouts pod and select Properties. Click Edit next to Advanced Settings and click on the TOC Styles tab. Set the style options as needed and then click on OK.
To test the control, generate the project. The Table of Contents control displays the same table of contents as in the final output.
If your project does not support a tri-pane design, you can add an index control to a topic to make the index file available. The index appears when the topic is opened with the index control. In the Design Editor, open the topic with the control and click where you want to add the index.