If enabled, the Block format overrides the Layout format : it is then possible to have blocks with different formats.
Select the Grid Item you wish to format with mouse overing :
> Label : block heading
> Value : block cells
> Total : block subtotals
> Grand Total : block down total
Then apply the proper format and click OK.
Note
The option Format negative numbers with parentheses of the Entity format and block format allows represent negative numbers in parentheses instead of using the minus sign. This option shouldn't be used on fields where data-entry is enabled.