An ExO Sprint is conducted in a total of 13 weeks. The order can't be changed because the outcomes of a week are the input for the following one.
The starting date of an ExO Sprint will set automatically the starting date of the 13 weeks. But you can delay a week. If you do it, all the following weeks are going to be automatically delayed also.
If you want to manage your ExO Sprint schedule:
1. Open the ExO Sprint going to your "Avatar / My Projects" and clicking on the ExO Sprint:
2. You can manage the schedule from the menu "Weeks":