Disable Virus and Spam Filters on Postfix

Good morning, on one of my Debian servers with ISPconfig and Postfix, I decided to disable the virus and spam filters, appropriately modifying the configurations of main.cf and master.cf.
I also uninstalled Amavis, Clamav and Spamassassin. I don't remember if I installed ISPconfig via the auto-installer or manually.
I found that the Postfix configuration file main.cf reported the following configuration again: content_filter = lmtp:[127.0.0.1]:10024
I wanted to know if there is some ISPconfig script that regenerates the service configuration files and how I can avoid it from happening again.
Thanks
fabrizio