Cci field is not showing up the emails to which I sent from Sent inbox


I’m reporting something that is annoying.

It is when I use the cci field, I can’t figure out to who I sent the email when I look from the Sent inbox.
Instead of displaying the list of emails it is displaying “Cci : destinataire non divulgué” (in french) which would be something like “Cci : undisclosed recipient”.

Is it a parameter that can be set ? If yes could you please share how ?

Many Thanks,