ddtddt, can you kindly tell me how to remove it for all users? Is there any admin option or need to change the template files?

<?php
/*
Plugin Name: Plugin Personnel
Version: 1.0
Description: Plugin Personnel
Plugin URI: http://piwigo.org
Author:
Author URI:
*/
add_event_handler('loc_end_page_tail', 'removecontact');

  function removecontact() {
    global $template;
   
    $template->clear_assign('CONTACT_MAIL');
    }




?>

It's work! Thanks!