Steering gear break in period?

Usually that screw is to adjust play.That slight amount of "Give or free play" in the steering wheel before the wheels start to turn.
That also has to be adjusted with the steering straight ahead. Steering boxes are built with what is known as "High Point" that is the center point between the full left and right stops. Say from full left to full right the wheel takes 6 complete turns of the steering wheel. High Point would be half that and should center at 3 turns.
Let me ask you this. When you start the car do the wheels start to turn,left or right on there own with no input from the steering wheel ? OR is it when the car is moving ?