In the header of the theme you can add an image that open a pop-up that show the content of the sidebar “Popup”.
Set the Image
For enable this icon you can go in: Theme option > Header > Pop up > Enable > yes
If you don’t what to use this feature you can simply disable it.
Set the Popup Content
Go in: Appearance > Widgets > find the sidebar “Popup” and add the widget you want to show in the popup