There is no simple way to make private, restrict access or disable the Public share folder. This has been discussed in several prior threads. As cpt_paranoia points out there used to be a way in the older firmware to disable public access to the Public folder but that was “fixed” in the OS3 firmware on the My Cloud units. There are several methods of dealing with the Public folder if one wants to use SSH. See the following links.
https://community.wd.com/t/public-share-public-access-on/96854
https://community.wd.com/t/removing-public-share-wd-mycloud/137086
Feel free to voice your opinion as others have done on the inability to restrict access the Public Share from the Dashboard at the following link.
https://community.wd.com/t/manage-public-share-user-access-at-least-a-read-only-option/97231
