This is because Microsoft has recently announced that they’ll be testing out a new home screen design for its Xbox One. The company claims to have listened to the feedback from its customers and users and will be trying out a new design based on that feedback.
According to Microsoft, “With this new experimental Home design, the first thing you’ll notice is we’ve removed the Twists from the top of Home in favor of separate buttons that launch your gaming experiences. The goal is to let you jump into Xbox Game Pass, Mixer, Xbox Community and Microsoft Store quicker than ever. We’ve also shifted things around to make more room for your recently played titles.”
Note that what you see right now is not the final design. Microsoft points out that the design could change in the future based on additional feedback, so it is not set in stone currently.