If you select the All orders option, all the order numbers from your order register will be opened and displayed in the structure map. The order number field will then be deactivated.
If you have many order numbers in your order register it can take a long time to load them all, and it may also be difficult to get a clear overview of them all in the structure map. In this case, it is better to use the second alternative, One order / project.
All order numbers that appear are orders with a main part that has status 1-5.