I must have hit some magic keystroke. Suddenly using the most recent copies of Gmail, Chrome, with those 7/8, etc. I'm getting double-spacing in Gmail for the Unreads and Everything Else. Until today it was always single-spaced (I used to have perhaps 15 items under everything else, now only eight or so fit).
Is there a cure? What was the cause, anyway?
Also, is there a "switch" that would hide the read messages?