Show Constraint Text - specifies that constraint text of the Constraint is shown.
Note that the constraint text is defined on the Full Text tab of a Constraint's Property Pages.
If you opened the View Options by right-clicking the diagram background, the check boxes you select set the default view options for any Constraints that are added to the diagram there after.
If you opened the View Options by right-clicking one or more selected Constraints, the check boxes you select change the view options of those Constraints.