3D Flip
This effect places the two pieces of content on opposite sides of a flat surface (like a piece of paper) and flips it in 3D space. The settings for 3D Flip are listed in the right-hand column.

Effect
Select "3D Flip"
Direction
The direction of the effect. It can be "up", "down", "left" or "right".
Zoom Out
How much the camera zooms out and in during the effect.
2.5 is a good amount. 4 is dramatic! The maximum is 10.