When you hang fresh pasta on a built-in drying rack, it helps maintain the shape of the pasta. If you were to lay the pasta flat on a tray or countertop, it may flatten or lose its intended shape. By hanging it on the rack, the pasta retains its form and texture as it dries. This is particularly important for delicate pasta shapes, such as farfalle or tortellini, which can easily get distorted if not dried properly.