ON and using Checkbox filters, the child categories (terms) are automatically unchecked when the parent is unchecked.', 'ajax-search-pro'); ?>
ON and nothing is checked within a checkbox filter - then the search will ignore it completely - instead of excluding everything unchecked.', 'ajax-search-pro'); ?>
For example: You have a custom field filter on "location" custom field, but some posts does not have the "location" custom field defined. This option will allow displaying them as results regardless.', 'ajax-search-pro'); ?>