This page redirects to an external site: https://developer.wordpress.org/reference/hooks/manage_screen-id_columns/
manage_users_columns is a filter applied to the columns on the manage users screen.
Add an extra column to the users table:
function add_extra_user_column($columns) {
return array_merge( $columns,
array('foo' => __('Bar')) );
}
add_filter('manage_users_columns' , 'add_extra_user_column');