Get User's other field instead of Username,in the View?

Question

I have one content type called "Test".In that content type i have Entity Reference field Referencing to Users called "field_authors"[can have more than one user] . I have created a view of this type.Here while showing 'field_authors' , it is showing User username, but Instead of username ,i want to show other field value of the User. How can i achieve this? Can anybody please help me? Drupal version:8.2.0
Details:
Currently View table column Output is: CC111,CC112,CC113 [which are the usernames of different users in the site]
I need user's other fields like "First name" instead of username in above Case.
I tried adding Relationship '(author) field_authors' and Added field in view Table 'field_authors'[selected use relationship] , But still output is CC111,CC112,CC113 etc instead of comma separated names.
I Got partial output after adding Relationship to that field,but since it is a multi field,output is coming in 3 different rows.Instead of it I need output in one row comma separated values.[Ex:Name1,Name2,Name3]

Answer 1

In order to use fields of user, you have to add a relationship (panel to the right, under contextual filter). Create a relation to the user entity.