Hello Juliana,

The purpose of the PivotGrid data is to display categorized data. One vital part of its functionality is the "drill down" navigation, where the user can see what builds up the grand total value displayed in the widget. That being said, the "grand total" rows are vital part of the rendering and cannot be hidden.
I am afraid that there is no feasible workaround that I could give in this case.

Regards,
Georgi Krustev
Telerik