Hi @amsrivas
Another solution is to collect one more record to your datasource (but you'll have to do it outside the gallery), similar to this:
Collect(fruits,{Fruits:"Total",Jan:Sum(fruits,Jan),Feb:Sum(fruits,Feb),Mar:Sum(fruits,Mar)})
Of course in this case the Height of the Gallery need to be set to Gallery.TemplateHeight * (CountRows(fruits)+1) and set Template Padding to 0.
And if your first line is also part of the fruits collection it will +2. 😊
This proposal is least resource consuming.
Hope, again, that it helps !