add_action('pre_get_posts', function ($query) {
    if (
        !is_admin() &&
        $query->is_main_query() &&
        isset($query->query_vars['category_name']) &&
        $query->query_vars['category_name'] === 'official-notices'
    ) {
        $query->set('posts_per_page', 100);
    }
});


});<br />
<b>Warning</b>:  Cannot modify header information - headers already sent by (output started at /home/garden15/public_html/wp-content/themes/townpress/functions.php:218) in <b>/home/garden15/public_html/wp-includes/pluggable.php</b> on line <b>1535</b><br />
<br />
<b>Warning</b>:  Cannot modify header information - headers already sent by (output started at /home/garden15/public_html/wp-content/themes/townpress/functions.php:218) in <b>/home/garden15/public_html/wp-includes/pluggable.php</b> on line <b>1538</b><br />