All views show thumbs. If you don’t have the rescan info option, then that means either there is no info there to start with, in which case “get content info” should be there, or your content source is not set to My Media Library.
I was struggling with this too. Eventually realized that by clicking “Options” on the movie i could manually force the metadata to be added – it wasn’t happening automatically for some movies because there were multiple movies with the same/similar names (example, “Taken” – I wanted the 2008 Liam Neeson one, but there was also one from several years earlier, and there’s now also Taken 2). So i guess the metamanager won’t automatically pick one where it isn’t sure, and you will have to select manually from the choices it provides. Now that i know this it is extremely easy to do, takes about 5 seconds from the couch with a few clicks of the remote, and adds all the metadata files to my shared movie folder.
still not sure what I did but it had something to do with the content sources. all good. I can now choose options and get content info and correct wrong metadata.