Aha! Here is my problem. When I right-click there, I get a different menu:
Cross-Tab:
Insert Chart
Insert Map
Format Cross-Tab
Borders and Colors
Pivot Cross-Tab
Move > Backward
To Back
Object size and Position
Cut
Copy
Delete
Cancel Menu
And that's it. No Group Sort Expert.
It might help to know that my version is the Seagate version 8.5.0.479