Intermediate Photopia Tutorial - Invert Motion
The Invert Motion option allows you to reverse all keyframes within a single layer. This feature is useful for easily changing a pan from right to left or a zoom from in to out. To access this option, simply right-click on any keyframe in the layer.
Please note that Layer Effects, like Fly-Ins and Fly-Outs, will not be affected by this change. Additionally, you may need to adjust any Motion Easing settings accordingly.