I'm trying to bring my library down below quota, which is going to require deleting hundreds of assets, but I can't find any way to delete more than one at a time. Doing it through the old deprecated library management tool doesn't work (it seems to delete them, but they show up again the next time the library is loaded), and the 'select all' function I've seen described when right-clicking on the library from within a game no longer appears to exist. Surely there must still be some way to accomplish this?