The image displayed is not square

If the top part of your image is smaller than the bottom image, or if your image on the bottom is smaller than the
top, the projected image is then “keystoning.”
To correct this, use the digital keystone correction found in the menu by the following procedure,
• Press Menu
• Locate “Keystone,” most likely found under “Image I” Sub-menu
• Select/Highlight “Keystone”
Press Left and Right buttons to perform keystone correction, until the image displayed is square.