pattygaleWed Oct 3, 2012 5:32 amControlling Visibility of Constraints:
Our apologies. The ability to turn off the visibility of constraints was removed for the Revit 2012 release. That's why you are unable to find "Constraints" in the list. (It is in the Revit 2011 list.) Thanks for bringing this issue to our attention. I will remove this topic from the help system today.
-- Patty Gale, Autodesk Revit User Assistance Team