Mail show side preview not working after Catalina upgrade to 10.15.1
This setting will not work after the upgrade - is there an easy way to fix?
MacBook
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If you have just 2 columns showing and you select show side preview (for the third column)
Move your mouse to the far right side of the screen and grab the edge and manually pull it to the left—you have to drag it a lot further than you would expect before it pops into view.