On the UUATheme documentation page at http://uuatheme.org/page-by-page-guidance/sidebar-content/ it says “The left-hand sidebar is the site’s menu. (In the mobile version the menu collapses.)”. I see that the menu collapses (disappears) if I narrow the window a little. How is one supposed to perform navigation to other pages in the page navigation structure in a mobile version of the site?