In the Legacy version, in the left side panel, we used to be able to right-click a notebook and see a submenu - to delete, rename, etc. That functionality is GONE in Evernote 10.12.5. (That's the version I'm using; I'm guessing the feature has been gone for all non-Legacy versions.)
Now we have to navigate to the list of Notebooks, find the one we're looking for, and perform actions there. But we had a shortcut right there, in the left side panel! Please, let us right-click there once again. Please.