Ordering. The order in which to display items. You can sort the list by order number by clicking on the Ordering label in the column heading. If the list is sorted by this column, you can change the order by clicking the arrows or by entering the sequential order and clicking the 'Save Order' icon. This is shown in the screen below.
Note that the ordering is only defined within a single category. For this reason, it is easier to re-order the list if you use the Category filter to select one category.