Mac Mail help needed
MacMail on all of my Macs at home looks exactly like I want it to look, screen shot attached:
Here's the problem, MacMail at my work looks totally different. (second screen shot attached) I don't see the viewer window at the far right, I have to double-click on an email to read and view it completely, which is annoying with multiple unread emails. I don't recall changing any settings, and I've tried and tried to find a setting that will bring the three-column configuration back as seen above. How do I get my MacMail at work to appear exactly as it does at my home? Any help would be greatly appreciated.
Mac Pro, OS X El Capitan (10.11.6)