turn off keychain in catalina

I am using another password manager rather than keychain. On my iPhone I was able to choose the alternate app for auto fill, and it has taken over filling logons on safari and in apps. On my mac with catalina I don't see that option. In fact I can't seem to get keychain to stop asking to fill logons. This isn't only on Safari for various apps and sites. I have turned off keychain in system preferences but it keeps activating itself again and again.

How can I get keychain to stop asking to auto fill so my alternate app steps in by itself?