The easiest way of getting rid of it is to r/click the blue area and select hide. If you select exclude it will filter the data out and won't appear in the tooltip. This technique is usually impractical because any other filtered worksheet will return the blue area when the filter on the other sheet is cleared.
Another method would be to duplicate the data element, and create a calculated field for the second one to filter out the data that you do not wish to see. Then you use the filtered field in your viz, and use the unfiltered field in your tooltip.
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I would definitely filter out the "total" (possibly even go as far to say that it shouldn't be in the data at all to begin with)
Then to access the total in the tooltip, create a calculated field that does this:
This is a lot more dynamic and will work as you add more months (there might be "compute using" setting that you need to change as well).
Basically, you only want the "base level" data and let Tableau sum it up when you need it
This was a very helpful response.