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
Thanks for letting us know, we're always experimenting with ways to improve the experience on Home and looks like you're part of one of those experiments. We recommend sending feedback (http://yt.be/help/feedback ) to help our team see your comments and prioritize requests.