In this article I will show you how to view table foreign keys.
From the Side Bar select Servers or press CTRL + G combination. In Servers window expand [your server instance] -> [your database name] -> Tables -> [table name] -> Keys. Foreign Keys have white key icon on the left side of name.
Table foreign keys in Azure Data Studio
Unfortunelly it's all what Azure Data Studio allows us to do. We can't see referenced table or used columns.
Below you can find key icons legend:
Key Icons in Azure Data Studio