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