In BaccS you may switch between Ribbon menu (default) and classical menu. In addition, when you use Ribbon menu, you can select from six ribbon menu styles: Office 2013, Office 2010, Office 2007, Mac Office, Office Universal and Tablet office. To switch menu type, click Application menu style button on the View tab of the ribbon.
Try to experiment with different menu styles. If you switched to Classical menu, you can find an option to revert back to the ribbon style in the Windows menu: