New to HDRP (and Unity), but lost the way to find HD materials

Hi,

I am just starting with Unity and I am messing around a bit in HDRP projects with the standard scene. Yesterday I had a project in which materials were updated to HD and I got tons of new materials. just remember something like HD wooden floors and different kinds of metal panels. However, I can't seem to find how I did it, and I can't recreate how I did it anymore. Whenever I start a new HDRP project, I upgrade project materials to HD materials, but it doesn't give me any new materials like I got yesterday. Anyone know what I'm talking about? Thanks!

 

Somehow you imported an asset, which would give you added mats. textures, meshes, etc.

 

Thank you, that can help me forward!