BenQ fp531 User Manual page 45

Geometry sub menu
Press or key to adjust the Horizontal Position,
press "Exit" to return to previous menu.
Press or key to adjust the Vertical Position, press
"Exit" key to return to previous menu.
Press or key to adjust the value of the Pixel Clock,
press "Exit" to return to previous menu.
Press or key to adjust the degree of Phase, press
"Exit" to return to previous menu.
How to adjust your Monitor 45