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