Enrich Atlas UI: close navigation bar automatically when clicking on a navigation item

Atlas UI would be enriched if the navigation bar would be closed automatically when clicking on a navigation item to head to that page. If somebody has opened a page it's not necessary for him to still have the menu bar open. To be honest, most users find it annoying when after opening a page the navigation bar doesn't close automatically. Because that would be seen as regular behavior. 

There should be at least the possibility of customizing the described behavior.