I‐TASSER explanation of each color in the proteins model

Hi,

I have been using I-TASSER tool and I think it’s great, well done.
I was wondering though, what each color means and I couldn’t find this information in any publication. For example, in the attached model, what does each color mean? Same question for the thick and thin parts of the structure, what do they represent?

This is the protein of interest: https://www.rcsb.org/structure/6h7d

Any help would be highly appreciated

Best regards