There is a warning being displayed
Please publish modules in offcanvas position
but you can't see because it is off the canvas!
Otherwise there is no content (e.g. a menu) to be displayed.
<a href="#" class="close-offcanvas"><i class="fa fa-remove"></i></a>
URL set to # is my preferred solution. What you're probably experiencing is menu caching. Try navigating to system > clear cache and clearing everything (or everything related to templates, menus).
There are some good extensions that add a clear cache button to the toolbar. They're ery helpful when setting up or rearranging navigation.