Eliminating stem walls at foundation

[KarenHamilton]

I have attached a file to illustrate my question.  When I create a monolithic slab, there is often a 12" wide, 4" tall concrete beam to runs the perimeter of my living areas.  It shows in the 3-D views and I don't want it there.  What setting do I need to change?  I tried setting the stem wall height to 0 but it keeps changing back to 4.  Thanks.

1.pdf