WordPress at a glance
function is not described

wp_unregister_widget_control() WP 2.2.0

Remove control callback for widget.

No Hooks.

Return

Nothing (null).

Usage

wp_unregister_widget_control( $id );
$id(int/string) (required)
Widget ID.

Code of wp unregister widget control: wp-includes/widgets.php VER 5.0.3

<?php
function wp_unregister_widget_control($id) {
	wp_register_widget_control( $id, '', '' );
}