Issue: The large "Basic Information" field suddenly went transparent - how/where to change?

A sudden change - possibly happened with last update?

Now, in my PROFILE, under About Me: Basic Information, all information under the line "my birthday" is on a TRANSPARENT field and, because of my background picture, cannot be read. ("My birthday" is OK; it's everything below.)

How do I make this not-transparent again? What box in that obscure set of boxes in the "Customize" section applies to that field?

P.S. I wish those boxes had understandable labels... any chance of an eventual diagram from someone who understands it to match the boxes to the actual profile fields?

TIA for help with this single section for now!