How do I sort by dashboard headers?

Add optional fields to the dashboard by clicking on the checkbox(es) that you want to display. 

The dashboard will, by default, sort by one of the columns.  You can change which columns you sort by, by clicking on the column name in the order in which you want to sort the columns.  By clicking multiple times on the column name, you can change between ascending and descending sort order, as well as remove that column from sorting.  Any columns that are being used for sorting will show a number next to the column, representing the sort order.  Any columns that are not being used for sorting will say 'unsorted'.