WD has blocked the ability (edit to add: through the Dashboard) to set the “Public” Share to Private. In pre OS 3 My Cloud firmware there was a bug in the Dashboard coding that allowed one to set the “Public” Share to Private but that was removed in the OS 3 firmware versions. Follow the “Removing Public Share WD My Cloud” link above for one option of dealing with the “Public” Share. You can use the forum Search feature (magnifying glass icon upper right) and search for other potential options like setting the “Public” Share to read only. Here is one such thread: Public Folder (Read only)
The ability to set the “Public” Share to Private is unfortunately a common complaint.
