LG Email: Landscape mode
When in landscape mode, contents of the email are shown on the right by default. You can expand the contents area by pressing the icon at top.
Floating Buttons: Whenever you are in landscape orientation, you can access the floating Back button to go back. You can also swipe up on the button to go to the Home screen. To move the button, drag it left or right. The standard home touch buttons are hidden, swipe left from the right edge to reveal navigation bar.