I feel incredibly stupid. I have some Groups with names in Bold; and, I can’t for the life of me remember how I formatted them. I would be grateful if someone here can remind me. Thanks.
Bill
O.K. O.K. So it was simply marking it as Unread. Apologies from a 70 year old beginner trying to get to grips with DEVONthink.
Bill who is old enough to know better but marginally too young to care… 
I’ll be 80 this year, and have taken to heart Ronald Reagan’s admonition not to hold the youth and inexperience of others against them. 