Hello,
Microsoft discontinued the autofill and saved passwords in August. It was communicated here. Leading up to this change, there was a banner in the authenticator app that communicated about this.
https://support.microsoft.com/en-us/account-billing/changes-to-microsoft-authenticator-autofill-09fd75df-dc04-4477-9619-811510805ab6
Unfortunately there's no way to recovered saved passwords at this point in the app.
As to removing 2FA, that's up to each service provider, whether they have mandated 2FA. If not, you have to go through each service to sign into your account to disable it.
If it is for your personal Microsoft account, you need to cancel it via https://account.live.com > Security.