BB layer Border

hallo ,
The issue is to slice a bowl . I’m trying to use BB layer component. There is an input
Border B Overlapping of the layers **Number
I can’t see any difference while changing a value of the number, so I can’t see how or if it works.
As I suppose that is important in my instance to use it, while the wall of that bowl isn’t thick and it’s rather curvy? I need to glue together all layers after cutting them out from a MDF board.
Could you help me and write how to use that input or how it should work?