shakeador, with the OS3 firmware released last September WD “fixed” the bug in the Dashboard that allowed one to change the public access setting on the Public folder. Here is one such post mentioning that the bug was “fixed”.
There are some potential ways to get around WD’s insistence of not being able to set the Public folder to private but it may involve some work to do so. There are several earlier threads, like the following, that discuss attempts to set the Public folder to private.
https://community.wd.com/t/public-folder-permissions/145699/2
