Recalling a password leak warning
There are several sites that will compare to leaked address/password lists - https://haveibeenpwned.com is the one I know best.
Also, Safari has an option that will show other warnings.
Prefs > Passwords > [enter admin password]
Any entry with a warning will show in Details, bottom right, what the warning is. I don't have any with a 'leaked' warning. I did a huge tidy-up of this list when it first became available & accept my remaining warnings as "don't care".
For obvious reasons a lot of this is blurred