If you are looking for disconnecting or revoking MFA for just a single user, then check the following link.

https://www.infallibletechie.com/2022/01/how-to-disconnectrevoke-mfa-for-user-to.html

If you are looking for disabling MFA for multiple users part of a profile or permission set, then check the following steps: 

1. In the Profile or Permission Set, Disable “Multi-Factor Authentication for API Logins” and “Multi-Factor Authentication for User Interface Logins”.

2. In the Profile or Permission Set, set “Session Security Level Required at Login” to None.