Do not isolate users. Start users in: User name directory
Select this option to specify that you do not want to isolate users.
All FTP sessions will start in the physical or virtual directory with the same name of the currently logged-on user if the folder exists; otherwise, the FTP session will start in the root directory of the FTP site.
Note
To specify the starting directory for anonymous access, create a physical or virtual directory folder named default in the root directory of the FTP site.
Caution
If they have sufficient permissions, any FTP user can potentially access the content of any other FTP user.