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.