Hi,
I'm not sure when this may have changed, but, I was looking to modify the trust settings for some certificates that I have, and for some reason, Keychain Access doesn't seem to have this functionality any longer. I know about the command-line "security" application, and I will look to see if it can do it, but the GUI application used to permit adjustment of trust by simply double-clicking on a certificate and changing the Trust values.
Now, selecting a certificate and double clicking, or trying Get Info, does nothing. I don't know if this is a bug to report, or, just a change in functionality...or, Just Me (tm).
Can anyone find a way to adjust certificate trust in the Keychain Access application on High Sierra (latest beta, Dev 5, for example)?