When Renaming an Assembly Constraint, the new name is displayed at the end of the system displayed assembly constraint, forcing the user to widen the Assembly Navigator and take up Work Area
To reorder the new Assembly Constraint name to the front of the display:
1. Select 'File-> Utilities-> Customer Defaults'.
2. Under General, highlight Assembly Navigator.
3. Select the 'All' tab on the right and at the bottom there's 'Constraint Name Display'.
4. It defaults to 'System and User'. Set it to 'User and System', OK and restart NX.
Now when an Assembly Constraint is renamed, the new name will be displayed at the front of the constraint listing, and the Assembly Navigator will not have to be widened to preserve Work Area space.