There is a G-sensor inside the camera, which has the orientation of the camera body as an absolute value.
It detects the differences from the initial angle of view in roll (left and right tilt = horizontal) and pitch (front and back tilt = depression angle).
This function assists you in restoring the angle of view if it shifts when you touch the camera.
In order to accurately return it to its original position, you need to make adjustments while checking the image.

Also, if the angle of view deviates by more than ±90 degrees from the initial installation angle of view, the indicator display may not be displayed correctly.