You can change the size of the help window like this

 

1. To increase or decrease the width of the navigation or the topics window, place the mouse pointer on the separator bar between the two window. When the shape of the mouse pointer changes to a double arrow, keep the left mouse key pressed and drag the separator bar to the left or to the right.
2. If you wish to enlarge or reduce the complete help display proportionally, point to any corner of the help display. When the mouse pointer changes to an arrow, keep the left mouse key pressed and drag the corner.
3. To change the height or the width of the complete help display, point to the upper, lower, left or the right edge of the help display. When the mouse pointer changes to an arrow, keep the left mouse key pressed and drag the edge.