You can enable and disable constraint search fields. One of two icons is displayed next to a constraint search field. The following icon distinguishes a field as enabled for searching:
The following icon distinguishes a field as disabled for searching:
When a field is disabled, the field is not used in the search criteria, regardless of the field's contents. This means, if you want to search for objects that have an attribute with no value, you must leave the field blank and enabled. This type of search would yield only objects that have no value for the blank field.
You can toggle a field between disabled and enabled by clicking on the displayed icon.
If all constraint search fields are disabled and a search is performed, an unconstrained search is performed.
If you enter a value into a field that is not consistent with the data type of the field's attribute, the field will be outlined in red to indicate the value entered is not valid.