SQLServer link manipulation via Diagrams

Hi,

In the list of features it says "Explore your tables and their relationships on an insightful diagram. Database objects can be modified directly from it, too."

I can't find a way to modify the database tables from the diagram. Specifically, I would like to draw links between tables.

I'm using DataGrip to connect to SQL Server via jtds on Mac.

Has anyone been able to do this?