Extended Events filtering
In SQL 2016 there are 5 filter predicates you can use to filter logins.
For NT login/user you can use all 5 but SQL login/user you can use number 3,4 and 5 only.


sqlserver.nt_username-Collect NT username
sqlserver.session_nt_username-Get the current session NT user
sqlserver.server_principal_name-Get the name of the Server Principal in whose context the event is being fired.
sqlserver.username-Get the current username
sqlserver.session_server_principal_name-Get the name of the Server    Principal that originated the session in which the event is being    fired.


Using tsql, you need to change my code depending on  what kind of account and real value you are using. 

    ALTER EVENT SESSION [test] ON SERVER 
    ADD EVENT sqlserver.sp_statement_completed(
     WHERE ((((([sqlserver].[username]=N'') 
       AND ([sqlserver].[session_server_principal_name]=N'')) 
       AND ([sqlserver].[server_principal_name]=N'')) 
       AND ([sqlserver].[session_nt_user]=N'')) 
       AND ([sqlserver].[session_server_principal_name]=N'')))
    GO


From GUI:

Once you pick select events, highlight event and click configure.



Under filter set your And/or condition, filed, operator, value.