In Alpha view - and after re-orientating, zooming in / out etc. I find my "Stage" has slipped away from the center - often with major chunks off screen. How do I 'pull' it back? Or perhaps pull the grid origin (0,0) back into the vertical and horizontal center. I'm sure I did this some time back but can't find how to do it agian!
The easiest and quickest way is to move it by dragging and rotating. For more precise movement, you may use the transform tool (Ctrl+T) in relative or absolute mode/kind.