Hi Hector,
Greetings from Syncfusion.
We suspect that you want to prevent one of the aggregate row values(when you are defining more aggregate templates(like FooterTemplate and GroupFooterTemplate)) when you are having only one group. When defining the aggregate templates, all the defined aggregate template values are exported to the excel document. It is not possible prevent one of the aggregate values in the exported excel file.
Please let us know if you have any concerns.
Regards,
Rahul