Mail Preview side panel
How do I get a preview sidebar pane to show in the Mail App, without having to click on the message itself?
It seems that I the only way to preview the message now is to click on the blue dot. It used to be a feature
in Mail that somehow disappeared in my mail app, even after closing the app and rebooting the computer.
I am using High Sierra OS 10.13.5 on a Mac Mini ( Late 2014 )
Mac mini, Mac OS X (10.7.2), Mac user since 1996 ( OS 7.3 )