BenQ FP231W User Manual page 26

Geometry sub menu
t u
Press or key to adjust the Horizontal
Position, press "Exit" to return to previous
menu.
t u
Press or key to adjust the Vertical
Position, press "Exit" key to return to previous
menu.
t u
Press or key to adjust the value of the
Pixel Clock, press "Exit" to return to previous
menu.
t u
Press or key to adjust the degree of
Phase, press "Exit" to return to previous menu.
26 How to adjust your Monitor