Steam Games May Come to Xbox App
In the image that Microsoft shared and deleted, it was seen that Steam games could be accessed from the Xbox application.

Microsoft provided a first look at the new Xbox interface in a blog post the other day. Saying that the application will now open "a billion doors", Microsoft surprisingly included a Steam filter in the interface.
We don't think Microsoft accidentally showed Steam games, as Microsoft quickly removed the blog post and image. This image could be the first leak of a new interface update that will bring all the games on your PC to a single screen!
Steam Games Coming to Xbox App
Although Microsoft has since removed the images, Phil Spencer's past statements and rumours circulating around may mean that Steam games will be available on Xbox consoles. According to rumours, this project is currently at a very early stage and the announcement was made well ahead of schedule, we can say that Microsoft leaked its own plans .

Epic Games Store's free games every week. Also, if you notice in the image, the Steam filter is not only on the TV screen, but also on tablets and handheld consoles. Microsoft seems to be planning to bring the games we own to all platforms.

make the Xbox app the home of PC gaming. If this project comes to fruition, it could usher in a new era for cross-platform console and PC games!
Source:
https://www.theverge.com/news/633478/microsoft-xbox-steam-games-support-ui