You might try the projector's keystone adjustments. They're in the Installation menu.
The projector needs to be horizontal to avoid keystone distortion and for best resolution. It has some minimal keystone adjustments but no lens shift. Keystone adjustment is an electronic adjustment, and using it sacrifices some horizontal resolution. To prevent keystone distortion, the lens needs to be at the same level as the bottom of the screen if the projector is "upright" on a table, or level with the top of the screen if the projector is mounted "upside down", hanging from the ceiling.