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Change the trust settings of a certificate in Keychain Access on Mac
You can view or change the trust policy of a certificate in Keychain Access.
Go to the Keychain Access app
on your Mac.
To open Keychain Access, search for it in Spotlight, then press Return.
Select a keychain from one of the keychains lists, then double-click a certificate.
Next to Trust, click
to display the trust policies for the certificate.
To override the trust policies, choose new trust settings from the pop-up menus.