Inherits from Skeletal Mesh Component with Materials property

Hi!

I’m using Unreal 5.3.2.

In the VR Template there is a class called B_MannequinsXR:

I have tried to replicate it, but I can’t. There is a Materials property in the original class:

That I don’t see in my custom blueprint class (which inherits from Skeletal Mesh Component):

The B_MannequinsXR class has also a Thumbnail:

This section is not present in my custom class:

Which is the parent class for the B_MannequinsXR class?

Or maybe, how can I add those sections to my own class?

Or, how can I make them visible?

I don’t know where they come from.

Thanks!