http://www.theverge.com/2017/1/25/14384132/microsoft-xbox-one-snap-mode-feature-removed
Microsoft is planning to kill off one of the more unique features of its Xbox One dashboard: snap mode. The software giant originally introduced snap mode as a method to watch TV or run an app side-by-side with a game. Microsoft is now on a mission to improve dashboard speed and multitasking, and snap mode is being removed to help improve the overall dashboard lag.