Hi Torrey,
I’d really recommend using a Blender Version before 4.0 for this: the Principled BSDF is pretty different in certain aspects, especially the Subsurface Scattering is different!
But if you insist on using 4.0:
in the new Principled BSDF, the Subsurface Scattering Weight is a bit like the Metallic slider…typically either 0 or 1.
So if you are using SSS, then the Weight should be set to 1 and the Scale slider should be manipulated to get the effect you want (that is a bit like the Subsurface Scattering slider in the ‘old’ Principled BSDF (before 4.0)). The Radius is the same as in the ‘old’ Principled BSDF, or as in the Subsurface Scattering BSDF.
I hope this helps.
