ZBrushCentral

BPR question with Fibers

I’ve been playing with all the cool new fibers and every time I try to make an adjustment in the FiberMesh settings I get this message: For a faster interaction speed while sculpting it is recommended that the FiberMesh will be generated as a single side fibers. To render single sided fibers as round cylinders, increase the BPR sides instead.

I click OK and then I can move the slider. But on many fibers I keep getting this message and having to click OK every time I want to make a change. This is when just using the Fibers from the library that runs along the top of the work space.
I don’t get this when putting fibers on tools.

How or where do I find that panel that deals with the single sided fibers as round cylinders?
thanks!
Karen