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It looks like the ability to turn off or hide those values isn't currently built into the product. You can add your vote to the following idea: https://community.tableau.com/ideas/4959 This idea page also links to some other threads on the community that may be helpful to you.
Thank you Sarah,
I did look through but missed that one. For now we'll just have to tell our internal groups to explain it is NOT a tool tip and use the Grand Total column they requested put on the dashboard to check the total.