Relation Diagram based on total layer

This would indeed be very useful and is often requested. Tools like Cognos and Qlik have very well developed implementations that people are used to, and leads to surprise when Discovery Hub does not have such a feature.

This is something I know people have been clamoring for.  It would be a powerful visualization/documentation tool that I think would provide a lot of value. 

I would be happy, if only we could have a diagram for a selected semantic model.

And if that could be included in the documentation for the semantic model also, it would be really great.