Matrix visual: Grand Total columns can't be formatted

Hi,
I would like to raise a formatting issue on our Power BI report.

* Current version (photo 1): the Total columns do not follow the same format as the other columns of the table. 
* Target version (photo 2): the Total columns have the exact same format as the rest of the table. This is what we need.

Today, the only way I get photo 2 is by building two separate blocks, with a second dashboard hidden underneath the first one, so that the Total gets the same format. It works, but it is a manual workaround that is fragile and hard to maintain.

Could we apply the photo 2 format directly in a single table, so the hidden dashboard is no longer needed?
Happy to walk you through it if useful.

thanks,
anto

PHOTO 1 (CURRENTLY)

PHOTO 2 (LAYOUT GOAL)