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
I can be a broken record of why this is a bad idea. Studio used to be where you could go to edit your videos, put the ads in the places you wanted, rather than mid sentence, and properly manage your channel. Now I spend about as much time looking for features as I do making vids