Trovata la soluzione grazie ad un post messo su Github
Creare un override (do per scontato che sappiate come fare) entrando nel template, cartella HTML/COM_USER/REGISTRATION il file da cambiare è DEFAULT.PHP con questo codice
<?php
/**
* @package Joomla.Site
* @subpackage com_users
*
* @copyright Copyright (C) 2005 - 2019 Open Source Matters, Inc. All rights reserved.
* @license GNU General Public License version 2 or later; see LICENSE.txt
*/
defined('_JEXEC') or die;
JHtml::_('behavior.keepalive');
JHtml::_('behavior.formvalidator');
?>
<div class="registration<?php echo $this->pageclass_sfx; ?>">
<?php if ($this->params->get('show_page_heading')) : ?>
<div class="page-header">
<h1><?php echo $this->escape($this->params->get('page_heading')); ?></h1>
<>
<?php endif; ?>
<form id="member-registration" action="<?php echo JRoute::_('index.php?option=com_users&task=registration.register'); ?>" method="post" class="form-validate form-horizontal well" enctype="multipart/form-data">
<?php // Iterate through the form fieldsets and display each one. ?>
<?php foreach ($this->form->getFieldsets() as $fieldset) : ?>
<?php $fields = $this->form->getFieldset($fieldset->name); ?>
<?php if (count($fields)) : ?>
<?php
if (isset($fields['jform_privacyconsent_privacy']))
{
$moveToEnd = $fieldset;
continue;
}
?>
<fieldset>
<?php // If the fieldset has a label set, display it as the legend. ?>
<?php if (isset($fieldset->label)) : ?>
<legend><?php echo JText::_($fieldset->label); ?></legend>
<?php endif; ?>
<?php echo $this->form->renderFieldset($fieldset->name); ?>
</fieldset>
<?php endif; ?>
<?php endforeach; ?>
<?php if (isset($moveToEnd)) : ?>
<fieldset>
<?php // If the fieldset has a label set, display it as the legend. ?>
<?php if (isset($moveToEnd->label)) : ?>
<legend><?php echo JText::_($moveToEnd->label); ?></legend>
<?php endif; ?>
<?php echo $this->form->renderFieldset($moveToEnd->name); ?>
</fieldset>
<?php endif; ?>
<div class="control-group">
<div class="controls">
<button type="submit" class="btn btn-primary validate">
<?php echo JText::_('JREGISTER'); ?>
</button>
<a class="btn" href="<?php echo JRoute::_(''); ?>" title="<?php echo JText::_('JCANCEL'); ?>">
<?php echo JText::_('JCANCEL'); ?>
</a>
<input type="hidden" name="option" value="com_users" />
<input type="hidden" name="task" value="registration.register" />
<>
<>
<?php echo JHtml::_('form.token'); ?>
</form>
<>
spero sia utile.