title: Trust access to the VBA project object model greyed out
body: <p>I'm on MS office 2013. I need to uncheck the "Trust access to the VBA project object model" check box for some testing purpose. But I'm unable to do so, as it is greyed out (and it is checked). </p>
  
  <p>What might be the reason. How can I enable the check box?</p>
  
  <p><img src="https://i.stack.imgur.com/uwT5m.jpg" alt="Trust Center image"></p>