When creating a 3D mesh, you can apply a profile (Fast, Normal or Detailed). I see that you currently have it set to "None". The profiles are designed to take the "guess work" out of knowing which settings to apply and generally give better results. I'd suggest trying the "detailed" profile to see if it suits your needs.
What you will get is not a "CAD" per se, but a mesh. In order to create a CAD from your mesh you'd need a CAD software to create surfaces and whatnot to create a model.