2014 theme: left sidebar not displaying on iPad

Our new website has menus with dropdowns/flyouts across the top of the site, and as a sidebar along the left side. On an iPad, the top menu displays at the bottom of the webpage, and will display at the top when the 3-lined bar icon is clicked, but the sidebar will not display at all.

Unfortunately, the site is password-protected, so I cannot provide a link.

No amount of tinkering with the CSS files or searching Google or the WordPress forums have provided any solutions thus far. Does anyone know of a way to alter the CSS, or if there is a plugin that will enable both menus to display on an iPad?

Thanks in advance for your help.