Can’t create a new mailbox folder in yahoo email on ipad anymore.

I used to be able to create a new folder in my yahoo email until very recently. Whenever I hit Edit, there isn’t any tab or menu to create new folder in mailbox. Been doing this for years so I know something is wonky here. Probably a recent “software upgrade” .... . I’ve turned my iPad off and on , closed and opened Mail but the create folder isn’t there. Grrrrrr!