Activity Leveling Priority

I have a schedule with a concrete resource loaded agaianst several hundred activities.  The concrete activties have been prioritized using the "Activity Leveling Priority".  When viewing the Resource Assignment screen, I used to be able to group by the "Activity Leveling Priority" but this option appears to have disappeared.

I have tried to run the P6 repair program from the Windows Control Panel, but since this version was installed by the vendor, I =nver received the installation cd.

Any suggestions on how to get my resources grouped by the "Activity Leveling Priority"

Tnaks in adavnce for any help