Thank you. I was using Head-Toe with cell clustering on. We've moved back to a centered configuration, so this isn't an issue for now.
You can see the difference between Left / Right and Binding / Non-Binding Edge here:
Binding Edge alignment
Make sure Sides Imaged is set to 2 Sided and set the alignment to Binding Edge.
I have a workflow where I rotate pages to landscape, then Impose 2 up Portrait with sides imaged Head to Toe. on a web sheet. Horizontal alighment is left edge.
The problem is the printer wants the back side of the web aligned to the right edge. How can I accomplish this?