Drain the macaroni well and let it cool completely before mixing in the dressing. This will prevent the macaroni from absorbing all of the dressing. As the pasta cools, stir it occasionally to prevent it from clumping together. You can spread the pasta in a 9×13-inch baking dish to speed up the cooling process. When it’s spread out thinly, it will cool faster. You can also chill cooked pasta in your refrigerator to help it cool completely. Make sure the pasta is mostly cool before putting it in your refrigerator to avoid heating it up.