In a few weeks, 1% of creators already using YouTube Studio will no longer see the ‘back to Classic’ button – you’ll be notified 1st & can still access Classic features you need! This won’t apply to everyone else until early next year. More info → https://yt.be/help/a7mG
Probably just better off leaving the creator studio alone, considering how long it has taken to actually roll this "new" one as well as the fact it lacks what the classic one has...