When navigating to an Apple login page in Safari on macOS 10.15 it shows a Apple ID login window and prompts me to enter my local user account password (not my Apple ID password). From what I can tell, this is a Safari feature and is not a part of the webpage.
Is there anyway to disable this? I have all Safari autofill settings turned off as I use a third-party password manager. It is super annoying to wait several seconds for this window to be displayed and then have to click "cancel" before I can log in.
It appears there is no way to disable this behavior. I have opened an issue in Feedback Assistant (FB7582188). Feel free to dupe it. https://openradar.appspot.com/radar?id=5003428010917888