themes-wordpress/vivre/patterns/hidden-search-form.php

<?php
/**
 * Title: Tags and date
 * Slug: vivre/search-form
 * Inserter: no
 */

?>

<!-- wp:heading {"textAlign":"center","level":1,"style":{"spacing":{"margin":{"bottom":"4rem"}}}} -->
<h1 class="has-text-align-center" style="margin-bottom:4rem"><?php echo esc_html__( 'Search', 'vivre' ); ?></h1>
<!-- /wp:heading -->
<!-- wp:search {"label":"","showLabel":false,"placeholder":"<?php echo esc_html__( 'Search', 'vivre' ); ?>","buttonUseIcon":true} /-->