Author page listing only 5 posts

Hi!
I noticed today that the author pages, where I used the loop to display a list of the author’s posts, are showing only the 5 most recent posts.
I think this is because I specified that on the home page I want only 5 posts displayed, but I’d like to override this for the author’s page, and the list of articles I want displayed there.
I found people posting for the similar questions 6 years ago, and it was solved with a plugin, but of course it’s a bit outdated now.

Here’s my code :

<?php
/*
Template Name: Auteur
*/
get_header(); ?>

<!-- This sets the $curauth variable -->

    <?php
    $curauth = (isset($_GET['author_name'])) ? get_user_by('slug', $author_name) : get_userdata(intval($author));
    ?>

<div id="content" class="<?php echo $curauth->user_nicename; ?>">
    <h1><?php echo $curauth->nickname; ?></h1>
    <dl>
        <dt>Site internet : </dt>
        <dd><a href="<?php echo $curauth->user_url; ?>"><?php echo $curauth->user_url; ?></a></dd>
        <dt>Biographie : </dt>
        <dd><?php echo $curauth->user_description; ?></dd>
    </dl>

    <h2>Les articles de <?php echo $curauth->nickname; ?> :</h2>
    <ul>
<!-- The Loop -->

    <?php
	if ( have_posts() ) : while ( have_posts() ) : the_post(); ?>
        <li>
            <a href="<?php the_permalink() ?>" rel="bookmark" title="Permanent Link: <?php the_title(); ?>">
            <?php the_title(); ?></a>,
            <?php the_time('d M Y'); ?> dans <?php the_category('&');?>
        </li>

    <?php endwhile; else: ?>
        <p><?php _e('Aucun article trouv&eacute; pour cet auteur.'); ?></p>

    <?php endif; ?>

<!-- End Loop -->

    </ul>

<?php
global $post;
$author_id=$post->post_author;
echo get_avatar($author_id, 200);
?>
</div>
<?php get_sidebar(); ?>
<?php get_footer(); ?>

I don’t know how to force the list of all the posts. Maybe with a query_posts?

Thanks for your advice!