Did Ainz use Master Source to view the NPC list? In season 1 episode 10 of Overlord, Ainz is able to view the NPC list. 

I thought Ainz couldn't use the interface at all anymore.

Did he use the Master Source to view the NPC list? If so, how?
He does not use the Master Source, he merely uses a display associated with the Throne; Albedo has used it as well.