User Manager for Polylang restricts Editors, Authors, Shop Managers and other non-administrator users. As a result, each user can only work in the Polylang languages, post types and taxonomies you assign on their profile. It suits multilingual sites where each translator or regional team should only touch their own language.
The plugin enforces these restrictions as WordPress capabilities. For example, a French editor cannot open, update, trash or delete an English or German post. This also holds on the edit screen, the list table, quick edit, bulk actions, AJAX and the REST API. Likewise, a Shop Manager limited to German cannot change English products or product categories through the WooCommerce REST API.