remove jnews meta box for all user

remove_action( 'after_setup_theme', array( JNews_Meta_Header::getInstance(), 'load_metabox' ), 10 );
    remove_action( 'after_setup_theme', 'jnews_initial_counter_metabox_load', 10 );
    remove_action( 'after_setup_theme', 'jnews_split_metabox_load', 10 );
    add_filter( 'jnews_load_default_metabox', '__return_false' );