Draw a rectangular frame, mark it on the black photo paper, and then click on the red light to observe whether the red light overlaps with the laser.
“F3 parameters”-“Other“-“Red light pointer“

Adjust the offset position of the red light XY and the proportional size of the XY according to the overlap of the red light and the laser in the previous step, and continuously adjust to achieve the effect of overlap of the red light and the laser.
