Sorting options allow you following:
- Show featured items before normal items: When creating item, admin or user with appropriate package can set item to be featured. Those items are highlighted everywhere in content (search listing, items element..). They are also put on very top as the first items no matter what. This is not much useful in some cases so you are provided to turn the feature off.
- Number of Items: Default number of items to be displayed in lists before it starts to paginate.
- Order by: Default order for items in all those listings.
- Order: Also default setting for listings of items to order them, ascending or descending.