Use middle button to drag the canvas
I'm using EasyEffects so I have so many items that some are constantly out of sight and I need to move my viewport to see them, but the way to do so is not very intuitive as I've found (wheel scroll for up and down, and shift-scroll for left and right, which is usually for documents).
I suggest that Helvum support drag the canvas with middle button. This operation is supported by e.g. GIMP, Inkscape, MyPaint and even Evince.