Is it possible to restrict public enum values in C#?

I am currently writing a software program for a tour, made up of exhibits. The exhibit object, at any given point, is in one of four states, defined by the ExhibitStates enum:

private enum ExhibitState { Ready, Active, Complete, Inactive };

For developers who will be setting up exhibits, there are only two "starting" states that I want them to be able to choose from:

public enum StartingExhibitState { Ready, Inactive };

Currently, I have it set up so that upon being initialized, the exhibit will immediately set its state to match its starting state, like so:

        switch (startingState) {
            case StartingExhibitState.Ready:
                SetState(ExhibitState.Ready);
                break;
            case StartingExhibitState.Inactive:
                SetState(ExhibitState.Inactive);
                break;
        }

I found myself wondering today if this was the best practice. Is there a better way to restrict which enum options are public and which are private? Or is it best to simply have the two separate enums?

Thank you so much for your time.