How to deactivate "!include conf.d/auth-system.conf.ext" without touching "/etc/dovecot/conf.d/10-auth.conf"?

Hello,

I want to deactivate the auth-system.conf.ext because it slows down the system and makes no sense because I utilize passwdfile.conf.ext.

I have put all my configurations into the local.conf file, and all the original configuration files remain untouched. I want to stay on this path because that way I know where I made changes, and updates won't cause me any hassle. But how can I deactivate an option that was activated in the original configuration files?"

Jens