Your sheets have outer padding of 4 on top, bottom, left, and right. Click on each sheet, then go to Layout and change the outer padding to 0. That should correct the issue.
Exactly what I as looking for.
I get the padding option directly on my left side of the dashboard in Tableau 10.4.
But I am unable to view this option in Tableau 10.2. How do I get it done in Tableau 10.2?
Padding was just added in 10.4, so I'm not sure it can be done in 10.2, unfortunately.