[Alberto]

I solved but not completely. In the page source shows correct, but in google search it’s not good. You can see.

https://albertifoto.it

add_filter( 'pre_get_document_title', function( $title ) {

    if ( is_home() || is_front_page() ) {

        $title = get_bloginfo( 'description' ) .' - Portfolio | '. get_bloginfo( 'name' );
    }
     return $title;
}
);