Everyone has given you good advice.
Cotton will eventually form permanent creases that no hack will fix. To avoid permanent creases, fold your quilt on the diagonal.
https://quiltnotes.com/learning-cent...store-a-quilt/
Another way to avoid this is to use wool batting. Wool gives great definition to quilting, and won't hold on to creases like cotton does. This is why so many show quilters use wool batting on top.