/* Custom Content Attribute */
function change_content_attr( $attr, $name, $term_id ) {
	/* For Category */
	if ( 'jnews_category_' === $name ) {
		$attr['sort_by'] = 'popular_post';
	}
	return $attr;
}
add_filter( 'jnews_get_content_attr', 'change_content_attr', 10, 3 );