site_oueb_2/wp-content/themes/twentytwentyone/template-parts/header/entry-header.php

<?php
/**
 * Displays the post header
 *
 * @package WordPress
 * @subpackage Twenty_Twenty_One
 * @since Twenty Twenty-One 1.0
 */

the_title( '<h1 class="entry-title">', '</h1>' );