To create a window without a Navigation pane
Open a help project file, and then click Add/Modify Window Definitions.
Adds or edits window definitions and the general appearance of the HTML Help Viewer. In the Create a new window type named box, type a window name for the new window.
Click the Navigation Pane tab, and then clear the Window with navigation pane, topic pane, and button bar check box.
Note
To customize the Help Viewer to appear as a window without a Navigation pane, you must create a new window. Any changes to your new window are then noted in the [WINDOWS] section of the project (.hhp) file.