Deleting Constraints
You can delete constraints using the Delete Constraint tool in the Constraints group or using the option from the mini-toolbar.
Using the Delete Constraint tool:
Select Delete Constraint in the Constraints group. The Delete Constraint tool is available when Show Constraint Tips is enabled.
Select the constraint to be deleted. In case of multiple constraints, click the dropdown and then select the constraint to be deleted.
Using the option from the mini-toolbar: