Shapeoko Pro XXL is not listed in the drop-down menu in Carbide Create version 520.
As far as CC is concerned the Pro is a Shapeoko 3. The difference is in CM for the configuration. Same with the post processor in CC.
The machine selection used to be used to limit the potential stock size, but since that limit was taken away doesn’t really do anything and is simply cosmetic.
EDIT: Please use Carbide 3D Shapeoko as the post-processor though since you have homing switches and a BitSetter.