Zen Grid Framework V4 (zgf4) themes use a flexible approach to adding an offcanvas module to your website. 

The offcanvas panel can be used to display any module content. It can also be used to display the responsive menu content for screen sizes smaller than the nav collapse value specified in your template settings. This makes the offcanvas panel a powerful tool to use for displaying information /fucntionality on your site that may not be important enough to be displayed on the canvas but your users need access to regardless.

Set the position, width and breakpoint for the offcanvas menu easily

The offcanvas position can be set to be displayed to the left or the right of the page. The template settings also provide the ability to specify the minimum breakpoint the off canvas menu should be visible on.