Tap the account tile for the account you’d like to remove from the app to view the account full screen. Tap Remove account to remove the account from the app.
If you have a device that is registered with your organization, you might need an extra step to remove your account. On these devices, Authenticator is automatically registered as a device administrator. If you want to completely uninstall the app, you need to first unregister the app in the app settings.