Microtek 710S User Manual page 16

Use the & key to select the icon, then press the key. A
screen similar as below will appear.
To go back to the previous OSD menu screen, move to the exit item, then
press the key.
Use the & key to move to the icon for vertical adjustment or to the
icon for horizontal adjustment, then press the key to
highlight, press & to move the entire screen left or right relative to the
center position.