While working at the reception, your main focus will be on managing guests. In this case, the navigation bar can take away an important space. To address that, you can maximize your screen real estate by enabling the fullscreen mode. With that turned on, the reception overview will use the full width of your screen.
To start the fullscreen mode, please click the fullscreen button above the list of guests.
Doing so will extend the width of the list to the width of your screen.
To exit the fullscreen mode again, please click either the same button or the "Exit full screen" button at the very top of the page.