Epson PowerLite Home Cinema 3020plus User Manual page 24

If one side of the image is taller than the other, make sure the projector is parallel to the
screen. If necessary, adjust the front feet so that the projector is horizontal.
Adjustable feet
Your projector automatically adjusts images that are wider at the top or bottom, but if
necessary, you can also use the vertical keystone buttons on the projector to correct this.
In addition to the horizontal keystone slider, you can use the volume buttons on the projector
to adjust images that are wider on the left or right side.
Note: Press either of the vertical keystone buttons to open the H/V–Keystone menu before
pressing the volume buttons. The volume buttons won't adjust the H-Keystone setting unless this
menu is active.
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Setting Up the Projector