The Plex Dance is probably the right move for you, but also consider this.
If you delete a library from inside Plex, that will eliminate your custom posters, playlists, watch history, and so on.
But… If you have not really used that library yet, or customized it at all… And there is nothing you need to save… Deleting and re-adding the library from the Plex controls is an alternative to the Plex Dance which will also force a total re-scan.
(I always suggest that people do not get into crazy customization of their Plex libraries until they are 100% sure that everything is well organized and scanning correctly, for exactly this reason. I had to delete and re-add my music library about 10 times while I was working on file organization problems.)
