For the life of me, I can't imagine why Evernote hasn't done this yet. Is there a weakness in the programming itself? Is it a philosophical matter? This is on the level of OneNote not allowing for the sorting of notebooks (unless you use OneNote 2016 and add the Onetastic add-on). It's so obvious a need that it should have been implemented long ago.
I just came back to Evernote because of the complexity of the OneNote/OneDrive relation, but it won't be long before I'll return (after I get my money's worth out of my subscription).