On the video editing panel, open the "3D" tab and then slide the "3D Mode" to green. You could then choose a 3D effect to apply to the final video file. There are in total 6 different 3D movie effects available for you to choose from: Red/Cyan, Red/Green, Red/Blue, Blue/Yellow, Interleaved, and Side by Side. Select one according to the 3D glasses you are using to enjoy 3D videos. For more vivid 3D effect, you could even directly drag the slide or set values in 3D Depth to adjust 3D depth. Tick "Apply to all" to apply selected 3D movie effect to all video files.