To automatically hide the Navigation pane
- Open a project (.hhp) file, and then click Add/Modify Window Definitions.

Adds or edits window definitions and the general appearance of the HTML Help Viewer.
- Click the Navigation Pane tab.
- In the Window type box, click the window you want, and then select the Automatically show/hide navigation pane check box.
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Build date: 4/14/2012