Thank you so much for your response!  I did go through all of the Verify/Rebuild steps as you outlined below, and was disappointed to see that it made no change; we still do not have the sort option as pictured in your screen shot.

This has been a source of frustration for about a year.  Nothing we try seems to fix this issue!

I do appreciate your effort to help us - I will keep looking for the answer to this puzzle.

Deb A.