[ClassiPress] Don't show saved Custom Form field on frontend

functions.php

<?php

/**
 * Don't show saved Custom Form field on frontend.
 *
 * @param object $field
 * @param object $post
 * @param string $location
 *
 * @return object|bool
 */
function childtheme_hide_my_custom_form_field( $field, $post, $location ) {

	$field_to_hide = 'cp_name_of_my_field_to_hide';

	if ( $field->field_name == $field_to_hide ) {
		$field = false;
	}

	return $field;
}
add_filter( 'cp_ad_details_field', 'childtheme_hide_my_custom_form_field', 10, 3 );