The central axis of the ends is fixed. The function of ends is to change the direction of force, but not effort.
When pulling heavy loads , a fixed pulley can be used to turn the force direction into the direction of easy output. When using the fixed pulley, the distance of force pull is equal to the distance of the object rising, it is not labor-saving and effortless. The tension at both ends of the rope is equal, so the output force and the input force, regardless of friction, the mechanical efficiency of the pulley is close to 1.