Can you rotate a canvas/file - not to view, but actually rotate it e.g. 90 degrees?

Obviously, I can spin it (on iPad here) when drawing to whatever but I want to make the right side the top for example. Am I overlooking something or is there no option to do this?

Change your art board size so the width and height are interchanged.

It’s a template with existing elements (a page layout) that needs to be worked on and exported as vertical, and horizontal.