1.  Use the scale picker to set the horizontal scale 
for the zoom window. 
2.  Use the position slider to set the horizontal 
position for the zoom window. 
3.  To set the zoom position to 0, drag from the 
Zoom Position key and drop to the “Set to 0” 
option. 
4.  To manually set the zoom position, drag from 
the Zoom Position key and drop to the 
keyboard icon. Type in the value for the zoom 
position with the keypad that appears.