Hi stephane-lavoisard,
You can open the /templates/ja_flix/html/com_content/category/blog.php file
And remove this code (line 166):
<!-- Show load more use infinitive-scroll -->
<?php
HTMLHelper::_('jquery.framework');
Factory::getDocument()->addScript (Uri::base(). 'templates/'.$app->getTemplate(). '/js/infinitive-paging.js');
Factory::getDocument()->addScript (Uri::base(). 'templates/'.$app->getTemplate(). '/js/jquery.infinitescroll.js');
$mode = 'manual';
if($this->pagination->pagesTotal > 1 ) : ?>
<script>
jQuery(".pagination-wrap").css('display','none');
</script>
<div class="infinity-wrap d-flex p-3 mb-4 mt-2 justify-content-center">
<div id="infinity-next" class="btn btn-lg btn-line hide" data-limit="<?php echo $this->pagination->limit; ?>" data-url="<?php echo Uri::current(); ?>" data-mode="<?php echo $mode ?>" data-pages="<?php echo $this->pagination->pagesTotal; ?>" data-finishedmsg="<?php echo Text::_('TPL_INFINITY_NO_MORE_ARTICLE');?>"><?php echo Text::_('TPL_INFINITY_MORE_ARTICLE')?></div>
</div>
<?php else: ?>
<div class="infinity-wrap">
<div id="infinity-next" class="btn btn-lg btn-line disabled" data-pages="1"><?php echo Text::_('TPL_INFINITY_NO_MORE_ARTICLE');?></div>
</div>
<?php endif;
?>