authentication – How to get rid of Microsoft Authenticator?

I have Office 365 subscription and it works well. However, I got Microsoft Authenticator app installed on my Samsung Galaxy and it got my Outlook account added there. I have no idea how that happened since I did not add it.

I’ve read the instructions from https://support.microsoft.com/en-us/help/4026727/microsoft-account-how-to-use-the-microsoft-authenticator-app but the instructions are complicated. I don’t need this Authenticator, so I want to get rid of it.

How can I get rid of it and keep my Microsoft account?