Fewer Repeated Security Checks - Office : Ultimate Tips and Tricks

Of course you want to be protected from potential threats to your computer and to your files. But why go through repeated security checks after you have confirmed that a file is trusted? After you confirm that a database containing active content (such as macros) is safe to enable, you don’t have to repeat yourself.
1. A message bar automatically appears below the Ribbon to indicate you have opened an untrusted database.
2. If you trust the contents and choose to proceed, click Enable Content on the message bar to trust the database and activate the content.

To manage Trusted Document settings:
1. Click the File tab to open Backstage view.
2. Click Options, then in the Options dialog box, click Trust Center.
3. On the right, click the Trust Center Settings button.
4. In the Trust Center dialog box, click the Trusted Documents tab to display options for working with Trusted Documents, such as clearing all previously trusted databases.