Deleting a folder

After moving all my movies to a new folder I would like to delete the old movie folder but just cannot figure out how to do this, the movies are on a Synology NAS and I am using a Shield Tv (Android 7.0.0) with game controller, Kodi Krypton 17.0, I can delete the folder on the NAS but it still shows in Kodi, I don’t see any menu option to delete it, any help much appreciated,