https://www.theverge.com/2017/10/16/16481340/microsoft-xbox-one-fall-dashboard-update

Microsoft has been gradually improving its Xbox One dashboard to make the experience a lot faster to use. While the original Xbox One launched with Kinect and voice controls, much of the navigation with a controller was slow and clunky. Microsoft started addressing some of those performance issues with some updates earlier this year, but today’s Xbox One dashboard goes a step further.

Microsoft is once again moving the guide so it’s ordered horizontally. You can switch between different sections using the Xbox controller bumpers or left thumbstick and d-pad. Sign-in, achievements, parties / LFG, friends, Home, messages, broadcasts, and a new action center (with settings) now form part of the updated guide. It works very similar to how it has in the past, but it’s much quicker to switch sections with the controller now.