Do a subforum search, magnifying glass icon top right, if you haven’t done so already. Its a well discussed issue with several possible methods of removing or hiding the “Public Share” on OS3. All methods will involve enabling SSH in the My Cloud Dashboard, connecting to the My Cloud using SSH and editing some files at the root level.
https://community.wd.com/search?q=%23personal-cloud-storage%3Awd-my-cloud%20Public%20Share
For example this discussion:
Warning: As always you proceed at your own risk when using SSH and modifying the OS3 firmware!!! One can easily render their My Cloud unusable by issuing the wrong Linux command while using SSH.
