Hi ya'll - I just added this feature request (via the suggest a feature in Mixpanel) but since I can't attach a screenshot I am following up here
When a board is saved to a board, it has these weird text icons that are a bit confusing. It makes it appear something is not rendering correctly. It would be awesome to have the ability to pick which visual shows when you link a board to a board (i.e. "make board cover") - similar to how you pick the album cover for you photos on your phone.