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