Suddenly, a sidebar I do not want
Perhaps it was an update,or perhaps I tapped something I shouldn’t have tapped, but now when I open an email, I get a 1/3 page sidebar on the right side, showing the email itself with tiny letters and very small pictures. I am technically incompetent, and cannot figure out how to remove this so I can get a full screen back. Can anyone help? Thanks so much!
iPad Air 2, iOS 11