Adobe Acrobat Professional 2017 signature validation

Hi all,

How can I configure Adobe Acrobat Professional 2017 to accept signatures automatically? The settings under Preferences / Signatures / Verification are the same as in my Adobe Reader. But in my Reader there are plenty of Trusted Certificates in "Identities & Trusted Certificates". In the 2017 Pro there are only 2. The user have to validate every root certificate manually. There are not much but it would be great if she doesn't need to do it every time she meet with a new cert issuer. What did i miss?

Thank you very much for your help.