Found only the first 10 articles

Does your theme have the “next page” link on the search results template? Can you go to the second page manually (ie. changing the url from https://www.example.com/?s=search to https://www.example.com/page/2/?s=search)? Or have you perhaps set the “Limit searches” option to 10? If you have, try disabling that option.

I fear it does not have “next” and “previous” page. I post here the code, if you’ll be so kind to give a glance at it:

CODE in search.php ——————–
<?php
/**
* The main template file.
*
* @package Yume Tan
*/
get_header(); ?>
<div id=”content”>
<div class=”center”>
<div class=”columnwrapp <?php do_action( ‘yume_display_ps’ ); ?>”>
<div class=”clear”></div>
<div class=”pagecontent”>
<div class=”fullwidth”>
<?php if (have_posts()) : ?>
<?php while (have_posts()) : the_post(); ?>
<div id=”post-<?php the_ID(); ?>” <?php post_class(); ?>>
<div class=”topbarpost”>
<div class=”fleft”><i><?php _e( ‘in’, ‘yume-tan’ ); ?></i> <?php the_category(‘, ‘); ?></div>
<div class=”fright”><span class=”postdate”><?php the_time( get_option( ‘date_format’ ) ); ?></span></div>
</div>
<div class=”postcontent”>
<?php if( has_post_thumbnail() ) { ?>
<div class=”thumb thumbleft”>
“><?php echo get_the_post_thumbnail( $post->ID, ‘thumbnail’); ?>
</div>
<?php } ?>
<h2>“><?php if(get_the_title($post->ID)) { the_title(); } else { the_time( get_option( ‘date_format’ ) ); } ?></h2>
<p><?php the_excerpt(); ?></p>
</div>
<div class=”postfooter”>
<div class=”fleft”>
<span class=”commentcount”><?php comments_popup_link(‘<span class=”icon comments”></span> No Comments’, ‘<span class=”icon comments”></span> 1 Comment’, ‘<span class=”icon comments”></span> % Comments’, ‘comment-link’); ?></span>
</div>
<div class=”fright”>“><?php _e( ‘Scheda &#187’, ‘yume-tan’ ); ?></div>
</div>
</div>
<?php endwhile; ?>
<p class=”pagination”>
<span class=”prev”><?php next_posts_link(__(‘Previous Posts’, ‘yume-tan’)) ?></span>
<span class=”next”><?php previous_posts_link(__(‘Next posts’, ‘yume-tan’)) ?></span>
</p>
<?php else : ?>
<h2 class=”center”><?php _e( ‘Nessun risultato’, ‘yume-tan’ ); ?></h2>
<p class=”center”><?php _e( ‘La ricerca non ha ottenuto risultati. Controlla la digitazione.’, ‘yume-tan’ ); ?></p>
<?php endif; ?>
</div>
</div>
<?php echo ‘Relevanssi found ‘ . $wp_query->found_posts . ‘ hits’; ?>
<?php get_sidebar(); ?>
</div>
</div>
</div>
<?php get_footer(); ?>

—————————-

OK, WE CHANGED THE THEME.
thank you anyway ??