Thanks for the response.
Further to my exploration below some additional feedbacks on the UX experience for regular viewers.
I added some cards to my board but not from an existing topic. However, while admins and groups allowed to modify/create can see the “frame” for edition and configuration settings, it appears that regular viewers also see the whole frames and configuration box although without ability to use any options (see below what a viewer sees when clicking on a card)
Wouldn’t it be more user friendly to leave the “editing frame” visible only to admins and for the others to only visually reflect the actual text/card description content from that frame?
Thanks a lot 
Cheers