How do I supress my keep out areas in the 3D View? (Version 16.5)

 I am trying to export my design to an IDF file format, but I can't suppress the keepout areas in the 3D view.  When I try to set the "Default symbol height" in the Design Parameter Editor to 0, it ignores my inputs and always resets the value.  I have set the "Package Height Min" to 0.  I have also tried setting the "Package Height Max" to 0, but it always uses the current value of the "Default symbol height".