Starting today, some creators will begin seeing YouTube Studio (beta) as their default experience. If you’re part of this group, we’re looking forward to hearing from you and adding new features based on your ideas and suggestions! Details → http://goo.gl/MxUgH4 https://twitter.com/YTCreators/status/968911748840525824 …
That's odd, could you file a feedback report with these steps: https://goo.gl/1ckkO5 ? It'll help prioritize the requests!