In a medium banked turn, once the desired bank is achieved, you should:

In a medium banked turn, once the desired bank angle is achieved, it's important to neutralize the controls to maintain that angle. By doing this, you allow the aircraft to maintain a stable flight path without unnecessary control inputs that could lead to an uncoordinated turn or excessive banking. With the controls neutralized, the aircraft is more likely to maintain the established turn without requiring continuous adjustments, thereby reducing pilot workload and improving the smoothness of the turn.

Maintaining the bank angle without increasing or decreasing control inputs provides better management of the aircraft's altitude and ensures that the airflow over the wings remains optimal for lift. This is crucial in preventing adverse yaw or potential overbanking, which could lead to a loss of control.