Do a quick sort of your EN library by clicking in your field headings or use the Sort Library option under Tools from the menu.
Sort your library references quickly by clicking on any of the displayed field headings to sort by ascending or descending order.
For a more complex sort order use the Sort Library command found under - Tools - Sort Library
The Sort Library command provides a way to arrange all references showing in the Library window for browsing, exporting, printing, or copying.
Click in the reference list.
From the Tools menu, choose Sort Library.
Select one or more field names from the lists in the dialog boxes. Enter the field names in the order you want the references sorted. (You do not have to use all five options.)
Click the button to the right of each field to indicate ascending or descending order.
With the field names entered as desired, click OK.