This website offers desktop and mobile views. The mobile view is selected automatically for many mobile devices. If you prefer a different view you can select it here.
The desktop view is best for larger computer displays.
Mobile views optimize the page layout for smaller mobile displays. The left sidebar menu can be quickly hidden and shown using the small menu button at the top of the mobile sidebar. There are two view options for mobile devices. One shows the left menu by default for new page views, and the other hides it.