If you want to change the order of items/categories in your library:
1. Using the arrows you can move the item up/down.
2. Click on Reorder in order to edit the items.
3. Click on the item and drag it to the desired location.
4. Click on Reverse in order to change the items order - top to button and viceversa.
5. Click on the 'X' sign in order to delete an item.
6. Click Done in order to save the changes.