Posted 6 November 2018, 12:18 am EST
Hi Hannie,
This is the design behaviour. If you want to show field header instead of ‘Grand total’ in case of single value field then you may use the formatItem event to get the desired functionality.
Please refer to the following sample which demonstrates the same: https://stackblitz.com/edit/js-bv5pnv?file=index.js
Also, we have created an enhancement request(Internal tracking Id: 352284) to show headers more like in excel pivot grid, we will let you know for any updates regarding this.
~Sharad