Why does automatic trapezoidal correction not work?

Solution:
Enter Settings-General Settings, make sure whether turn on the "Automatic Trapezoidal correction" function.
Note: automatic trapezoidal correction is triggered after the projector moved position. If the projector position remains unchanged and adjust trapezoidal correction manually, automatic trapezoidal correction will no longer be triggered.
* Automatic trapezoidal correction only supports vertical trapezoidal correction, while automatic horizontal trapezoidal correction is not supported temporarily.