What does TO in a gray box mean in mac Mail email list?
I just upgraded to Catalina, and now every entry in the list of emails for my inbox has a "TO" inside a small gray box in front of each entry in the list. What is it, and how do I get rid of it?
I have the year-old 27" iMac and Catalina 10.15.3
iMac 27", macOS 10.15