The WD Sync software is installed on your computer and can be configured on the computer usually by the WD icon in the task bar area (on Windows). Or one could remove WD Sync (since it causes so many problems) and use a third party sync program (like Free FIle Sync for example) provided they do not need remote sync capability with most third party programs do not offer.
There are a number of past discussions where people have found their My Cloud filled with hidden files because of WD Sync. One can use the forum search feature (magnifying glass icon upper right) to find those past discussions. Here is one example of a past discussion that explains how to use SSH to find and remove the offending WD Sync hidden folder on the My Cloud. As always when using SSH one is on their own.
