The calibration of border looks like diagonal as the picture shows, according to guide customer can move up/down left/right light/dark and zoom but cannot fix th diagonal border.
The craft tool alreday placed in the right place.
2、 Adjust the image as the engineering installation diagrams, middle screen first, then left and right.
3、 Set the right ZOOM value, and adjust the screws to fix.
Without importing the engineering installation diagrams.