There is no way to turn this news feed off. The best you can do is “manage interests” which kicks you out to msn.com to have you tell it what topics you prefer.
Definitely not trying Windows 11. I hate software that pushes news onto you, unsolicited and with no easy way to turn off! I’ve have my news sources that I read and trust. I don’t want things pushed to me from sources with some commercial agreement that doesn’t have my interests in mind.