It is not possible to run a report on overlaps between polygons at the click of a button. The Add Sites option under the Run Reports tab allows users to add multiple individual polygons, but not run a report on the overlaps.
To run a report on the overlaps, follow the steps described below:
The image below shows two polygons, Trade Area A and Trade Area B, and where a portion of the polygons overlaps.
The image below shows the new polygon of the overlap area. The overlap polygon is named Overlap area, which can be found under the My Polygons layer.
The downloaded reports are available in the REPORTS section of the Home tab.