In Creo 10, the reorder/restructure workflow in the model tree is enhanced to avoid unintentional restructure operations. There is now a better indication whether your current drag & drop operation is a reorder or a restructure operation.
If you want to modify this behavior, you can use the "enable_dragdrop_on_components" config option.
Try out the latest version of Creo with our free trial, available at http://ptc.co/KDha30q96py
Read more about what is new in Creo: http://ptc.co/RAb730qr0d2
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