display connected User to post

by

That code retrieves the information, it doesn’t do anything with it. you have to echo out the data, expect $users to contain an array of WP_User objects

e.g.

$users = get_users( array(
  'connected_type' => 'multiple_authors',
  'connected_items' => $post
) );

foreach ( $users as $user ) {
    echo '<p>'.$user->name.'</p>;
}