LG CineBeam Laser 4K Owner's Manual page 28

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3
To adjust the focus of the image, slowly adjust the focus ring to the left or
right while looking at the top center of the screen. You can adjust the focus
most effectively when the left and right screen are balanced. When adjusting
the focus on the screen, do not let the product shake.
– Before using the focus ring, press the lower left corner of the focus ring
cover once to open the cover. Please open the focus ring cover before
using the focus ring.
4
If the angle of the projection is not perpendicular, use the [Edge Adjustment]
function. (Use the Up/Down/Left/Right buttons on the remote control to
adjust the top/bottom/left/right of each angular point.)
Focus Ring