The left window pane of the help system, specifically the Help Navigator, can be hidden, thus expanding the size of the help page display window.

To close the Help Navigator (left window pane):

In the Help system, select the View menu.

Clear the Help Navigator check box. The left window pane closes and the right window pane expands.

Alternately, click the back and forward arrows in the bar dividing the Help system window panes. This opens or closes the left window pane.