I checked the documentation again and using this code, it works:
$featured_posts = get_field('more');
if( $featured_posts ): ?>
<div class="container-btl"><div class="row">
<div class="col-md-4"></div>
<div class="col-md-8"><h2><?php echo $heading; ?></h2>
<ul style="list-style:none;">
<?php foreach( $featured_posts as $featured_post ):
$permalink = get_permalink( $featured_post->ID );
$title = get_the_title( $featured_post->ID );
?>
<li>
<a href="<?php echo esc_url( $permalink ); ?>"><?php echo esc_html( $title ); ?></a>
</li>
<?php endforeach; ?>
</ul></div></div></div>
<?php endif; ?>