Are you taking about just switching off super cruise ASSIST or just targeting the star instead of the planet? I'll give it a try
Super Cruise Assist will be disabled by going to full throttle or by pointing far enough away from the targeted destination, you need to be in the blue zone throttle wise (50-75%) and pointed at the target for it to work. The trouble is if you get too close to the target before getting the throttle at a suitable setting SCA tends to mess up the approach.