Click the Start button and type services.msc – the Services app should be displayed in the search results.If Plex is running as a service, you should just stop that service. Stop the Plex instance running on the server by right-clicking the Plex system tray icon and the select Exit.Log onto your Plex server as the user account that is running the Plex Media Server instance.

To change the Plex data directory in Windows, use the following steps: Moving the Plex data directory in Windows

Changing the location of the data directory is a manual process that is done outside of Plex. The reason is that the setting does not exist. Moving the directory, however, is not as easy as changing a setting in the Plex Media Server settings. The default location of the data directory is on the system drive, so if that drive in your Plex server is small, then you may want to look at moving the data directory. If your Plex Media Server instance contains a lot of media files, then it may make sense to move the Plex data directory in Windows to another location.

Plex media server updates hidden folder