NEC NP-P350X - Manual (Page 41)

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2. Projecting an Image (Basic Operation)
Adjusting with the remote control
1. Press the KEYSTONE button.
The Keystone bar will be displayed.
2. Use the  or  button to correct the keystone distortion.
Adjust so that the right and left sides are parallel.
3. Press the EXIT button.
The Keystone bar will be closed.