Official comment
When you receive a shared folder you have the option (in the pop up that appears if running the Syncplicity client) of selecting the location where the shared folder will be stored. By default this is in a folder named <your login id>\Syncplicity on a Windows system. But you can override that and place it anywhere. You can also find where the folder is through the Manage interface of the Syncplicity client. How to do these things is covered in this article:
https://syncplicity.zendesk.com/hc/en-us/articles/200962230-Navigating-and-managing-folders