Increase Category Post per Page

/** Increase Category Post per Page */
function increase_category_post_per_page( $attr ) {
    if ( is_archive() && is_category() ) {
        $attr['number_post'] = 20; /** Fill with number of post per page */
    }
    return $attr;
}
add_filter( 'jnews_get_content_attr', 'increase_category_post_per_page', 10, 1 );