The account you are attempting to configure is likely set to operate in Simple Virtual Directory mode.
The Virtual Directory (VD) system enables the administrator to link any directory or drive to the root. When a client requests the root directory from the server, the specified VDs are sent to the client, allowing navigation to subdirectories of these VD directories. The VD system seamlessly handles path translation.
Security settings can be defined for each virtual directory, with all subdirectories under the VD inheriting the security settings of the VD.
There are two modes in which a user account can operate concerning the virtual filesystem: Simple and Standard modes.
Simple Virtual Directory Mode: When a user account operates in simple directory mode, the administrator can assign only one directory to represent the virtual directory for that user. Instead of viewing that directory as a subdirectory of the root, the selected virtual directory becomes the directory where the user is placed upon their initial login to the server. Essentially, the chosen directory serves as the root directory.
Standard Virtual Directory Mode: In standard mode, the administrator can add multiple directories as virtual directories to a user account. These directories will appear as subdirectories of the root when the designated user logs into the server.