So, since 3D viewer is a great too to use with the Auto-Fab, here are a couple of advanced features.
Currently, the feature is only available for Auto-Fab and Auto-QC.
5.2 Advanced Visuals.
As you can enter the 3D viewer while Auto-Fab or Auto-QC is on, visuals can be quite useful.
In the case where you are not sure where a specific details go/should be attached or what are the specifics of that certain part, you can open Visuals while checking or fabricating an assembly, and see that part with visuals.