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
Please don't take my word as gospel here, but I actually like the design of the new studio. Not so much the features but the design is very clean. How about stick with classic studio but update it's design?!