Doogee's Mix 4 prototype smartphone has been unveiled on a popular YouTube channel, and it seems the Shenzhen-based company has come up with a novel way of discarding the controversial notch. The Mix 4 device has a mechanical slider, allowing the front-facing camera to be neatly placed behind the display when not in use.
https://www.notebookcheck.net/Doogee-s-Mix-4-does-away-with-the-notch.296522.0.html