<?php

/**
 * change 'product_cat' to your desired taxonomy.
 */
$categories = get_terms( array(
  'taxonomy'     => 'product_cat',
  'hierarchical' => false,
) );

$cat_list = array();
sort_terms_hierarchically( $categories, $cat_list );

if ( $cat_list ) {
  echo '<ul class="terms-list">';
  echo    sidebar_cat_list( $cat_list );
  echo '</ul>';
}

?>