View file understrap-master/sidebar-footerfull.php

<?php if ( is_active_sidebar( 'footerfull' ) ): ?>

  <!-- ******************* The Hero Widget Area ******************* -->

  <div class="wrapper" id="wrapper-footer-full">

    <?php dynamic_sidebar( 'footerfull' ); ?>

  </div><!-- #wrapper-footer-full -->

<?php endif; ?>