No, R is not the Scaling factor.  R is the stress ratio = Min_Stress/Max_Stress  In the details window, the Type can be Fully Reversed which is an R = -1 and was the type of loading for the S-N curve, or the Type can be Zero-Based, which is an R = 0 and is the type of loading for your problem.  The scale factor for Case (a) is 1.0 if you apply the force that creates 650 MPa of stress.

You will use a different scale factor for Case (b).