Mis-arrange means to arrange something incorrectly or disorderly. To find antonyms for this word, we need to look for words that mean to arrange something in order or proper arrangement. Some of the antonyms for mis-arrange are arrange, organize, tidy, sort, systematize, categorize, classify, order, straighten, and align. For instance, when you arrange a bookshelf alphabetically, it means you are organizing it. Similarly, when you keep your clothes in a closet according to their color scheme or size, you are arranging them. Therefore, by using appropriate antonyms of mis-arrange, one can refer to the task of arranging or organizing things in a structured manner.