Sort and group results
Sorting results means changing the order in which they are displayed according to a specific criterion, whereas grouping them implies breaking the order by creating small groups instead of a continuous list without affecting the sorting order in any way.
To modify the sorting order
Click the Arrange by command located on the result title bar.
Choose an available criterion in the displayed list.
To group results
Click the Arrange by command located on the result title bar.
Click Show in Groups.
-OR-
In the View menu, point to Arrange by and select Show results in groups.
Sorting fields may be different from one category to another.