Ron Stacy":14n8i99o said:
Thanks, Chas. I just went to preferences and saw that the "Classic" was NOT checked, so that ain't it. Sigh!
Okay, I figured it out. After playing around with Mail for QUITE a while, I was able to duplicate the issue without turning off classic mode.
Here's what I think happened: In the three-pane view (as seen with your iPad, aka "modern" view), there is a thin line between the list of emails and the content of the highlighted email. If you pull that line by dragging the mouse all the way over to the right, the "content" window disappears, with no obvious way to retrieve it ... but you can. If you put your mouse all the way to the right of the Mail window, you should see a little "arrow cursor" that indicates "pull to the left" (it is resistant to screenshotting, or I'd include one here -- the chart below has an example, called "Move left or right"):
It's tricky to get vs the "resize the entire window" cursor, but when you get the "move left" one you can pull back the content window to whatever portion of the screen you like.