Revoke an App Password for Gmail Using 2FA

To delete an application-specific password generated to access your Gmail account through IMAP or POP:

Manage Third-Party Apps With Account Access

To manage third-party apps that have access to your Gmail (and other Google services) even if you don’t use 2FA or app-specific passwords:

Other Security Features

The Security tab contains several other ways to keep your account secure such as the Security Checkup that provides personalized recommendations to secure your account along with alerts of any ongoing issues. Also located on the Security screen are:

A list of devices that are currently signed in or have been active in your account in the previous 28 days.A process to manage a lost or stolen phone.A list of the sites and apps you sign in to with your Google account.Recent security events related to your account.Your recovery phone and recovery email.Your password.Any linked accounts.