LG HU810PW Owner's Manual page 31

Adjusting the Position of the Projection Screen
You can use the Projection Screen Position (Lens Shift) Adjustment Dial to adjust the
position of the projection screen without moving the projector up, down, left or right.
If the projection screen does not align properly on the screen even after adjusting the
position of the projection screen using the Projection Screen Position (Lens Shift)
Adjustment Dial, use the [Keystone] function.
Projection Screen Position (Lens Shift)
Adjustment Dial
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