Page to select package type has disappeared after update

Hello,
after upgrading the MyParcel plugin from 1.5.6 to 2.0.5, the process has changed quite a bit. I’ve read up on the documentation, but it’s not exactly clear what I need to do to make it work as indented.

In the past, my client clicked on export to myparcel, and was then presented with a page where she could select an alternate shipping method (large package/small package, different cost). Now, when she clicks on export to myparcel, this question is no longer asked, and everything is exported as large package, meaning she is presented with higher shipping costs.

I assume this has something to do with the new way of handling the process. But the documentation is not very clear to me, can you please explain what changes I need to make to make it work as before (selection between shipping methodes possible) again?

Thank you!