it could be an easy one, but for whatever reason we are stuck.
A design was recuperated from a archive, and now the plane assignment menu pick in planes is grey.
We did not force the planes to be fixed during archiving.
We tried different modes: select mode, route mode, draw mode, as well as we tried with selected planes and unselected planes.
So if you know how to reactivate plane assignment menu please let me know. Or if you just have a suggestion.