I did Move and it only move the current week. It doubled up on the following week, without moving the subsequent weeks.
Another test shows that it seems Push is not possible on an active week. I can get that option on the next week (2nd of my current plan).
Current Week:
Next week:
So, even though my plan start isn’t set until Tuesday, It looks like I have to push from the “unstarted” week, and then move the current week.
Seems a bit limiting considering that I have not even started the plan. But I guess it works. 2 steps instead of one.