To delete
an aim constraint, delete the aim constraint node.
To delete an aim constraint
Select the aim constraint node only.
(Select the aim constraint’s selection handle if displayed, or use
the Hypergraph to select the aim
constraint node.)
Select
Edit > Delete (default
shortcut: (Linux
and Windows) or (Mac
OS X) key).
(Linux
and Windows) or 
(Mac
OS X) key).