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 literally use the classic all the time and the only time I ever use Studios is when I'm editing a title or description of my video. Please keep the Classic