You can change the Order Numbers and click the ‘save’ icon at the top of the column.
You can also use the up and down arrows to reorder categories.
If you set all the categories to the same number, they will automatically alphabetize themselves.
Here they’re all set to 10, except the Action Figures subcategory called Don’s Category, which is set to 1. You should set them all to 10 or 11, to leave room to push featured categories to the top.