No image was provided here. The direction of the force exerted on the ball by the spring is dependent on which force is greater. When measuring force, the unit of measurement commonly used is called Newtons because Isaac Newton proposed three laws of motion.
If the force on one side is greater, the arrow would be facing whichever side the greater force is pushing toward. If the force for the two sides is equal, then there wouldn’t be an equal sign; it’d be equal.