Navigation Locked

When a User sets view to Standard, the slides are shown on the left. I want the User to be able to go to the Main Menu; however when I click on the Menu slide a message box pops up that says: "Navigation Blocked You must proceed through course as designed". 

How do I enable that. I don't have the slides locked in Slide Properties. 

The issue for me is that I want the User to be able to get back to the Menu slide at any time. Is there a better way to do it than what I am trying?

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