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If you are able to upgrade to Desktop v9.3 there's a new feature to not include coloring in the Grand Total segment. However, this feature will only be exposed if you have a continuous measure coloring the viz. In the below screenshot I changed the [Shading] dimension to a measure using the AVG aggregation which makes the viz look like this:
Next, we can double-click the color legend to open the options menu to de-select the "Include Totals" option:
After clicking OK the viz shading switches to look like this:
If upgrading to v9.3 isn't an option I think the easiest way to not include shading for the Grand Totals segment would be to make separate worksheets for the column grand totals, row grand total, and then the non-grand total section of the viz, and then combine them all onto a dashboard together.
Hope that helps, thanks Lucie!