In the ServiceNow Change Management base platform configuration, the transition from the Review state to the Closed state requires specific documentation of the outcome.
* Close code (B): This field is used to categorize the result of the change (e.g., Successful, Successful with Issues, or Unsuccessful).
* Close notes (C): This is a mandatory text field where the implementer provides a summary of the implementation and any post-implementation observations.
While " Closed by " and " Closed " (date/time) are important for auditing, they are typically system-populated automatically when the state changes to Closed and are not manual requirements for the user to fill out to trigger the state transition.

Explanation
sys_choice.list where table == problem and
problem state en 1 Open false 1
problem state en 3 Pending Change false 2
problem state en 2 Known Error false 3
problem state en 4 Closed/Resolved false 4

There is no such a view called Master or Agent View. Note: there is a view called Default View that is meant to be viewed by agents.