How can I set two sizes using Tableau tree map

Question

A tree map can consist of the larger boxes and inside differing sizes of smaller boxes. Nothing I do in the shelf allows me to set two different measures sizes. I want my larger boxes to be proportional to my Total Population and the smaller boxes inside each to be proportional to my Utilization %. The three images I attached are my visualizations as well as one I found online that does exactly what I am trying to do.

Answer 1

In Tableau, you can only use one set of size per sheet.