Please follow below steps to check:
1) Press the button “Keystone” to correct distorted images resulting from an angled projection.
2) Reset the projector device for default setting and try again. How to reset the unit to default setting
Note: Each model of Projector may have different UI arrangement.
If the error issue still exits after default setting , please contact your local technique support center or service center for help. https://www.asus.com/support/CallUs