Thick & Chewy was different, and dropped when their Pan Pizza was released, leaving the new Pan and the original Thin & Crispy pizza on the menu. The Thick & Chewy was a typical, moderately thick and doughy pizza crust, common among many low cost pizzas sold today. It's often called American style.
Is "thick & chewy" what they used to call their "Pan pizza", or is it a different style?