SOLUTION
The projector uses an optical keystone correction function, so the image can be
adjusted as below:
However, this projector does not have a horizontal keystone correction function.
The projector must be placed horizontally to the projection screen. If you
encounter this problem, it is probably because the projector has not been placed
horizontally to the projection screen, or the projection screen is not vertically
positioned.
Solution: Adjust the projector's position so that it is horizontal to the screen.
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