Note that the older first generation single bay My Cloud’s using the v4.x firmware do not have that option. Users with the v4.x firmware can change the SMB setting on their PC or they can use SSH and try to change the setting within the v4.x firmware. How to do both are explained in Windows 10 Specific Method 6 in the following post:
https://community.wd.com/t/compilation-of-windows-10-methods-steps-and-solutions/142576