Epson Z8250NL - Manual (Page 169)

Adjusting the Projected Image
169
C
Use the [h] button on the remote control or the [w/ ],
[v/ ], [</ ], and [>/ ] buttons on the control panel to
select the area you want to adjust, and then press the [Enter]
button.
When selecting a corner, you can adjust the two sides next to the
corner.
D
To adjust the shape, use the [h] button on the remote
control or the [w/
], [v/ ], [</ ], and [>/ ] buttons on
the control panel.
If the triangle in the direction you are adjusting the shape turns
gray, as shown in the screenshot below, you cannot adjust the shape
any further in that direction.
q If you press the [Default] button while adjusting, the value that you are
adjusting is reset to the default.