The Off-Canvas is for the Breakdance Builder element, which can be toggled via trigger selectors. It will appear from the top, left, right, or bottom edge of the viewport.
It is a flexible element. You can add any other elements inside of this element.
The panel will slide in/out with a trigger selector. The trigger selector element can be a link, button, animated burger button, icon, etc. You can use the multiple trigger selectors for the toggle effect.
You will get this element under the Interactive category.