You may have noticed that while creating the sections in the ASN, they get ordered automatically in alphabetic order. When existing sections are renamed, they remain in the same order when they were created irrespective of their name. I have not seen any assembly preference/customer default setting to control the order of the sections. Seems that it is hard coded.
Thanks for your answer. In my case, I think they appear in creation date order.
I have a lot of sections starting by: X_Hole 1, Y_Hole 1, Z_Hole 2, X_Hinge... and I'd like to have first all the X-plane sections, then all the Y-plane sections and the Z-plane sections at the end.