At a minimum there is SUM([Number of Records]).
Put that on Details shelf and convert it from "continuous" to "discrete" (changed the green pill to blue) and then you can drag it to the rows shelf right after the [Partner] pill.
But I suspect you have other things going on in that sheet. Maybe table calcs or other things that will result in [Number of Records] no doing what you need. If that doesn't work for you, then we'll need to see a workbook.