The internal 2D to 3D converter is available under both Convert and Burn modules. That's to say, no matter you want to convert 2D Blu-ray/DVD/video to 3D video file or burn 2D video to 3D Blu-ray/DVD, the internal 2D to 3D converter will satisfy you well.
Under Convert module, after loading Blu-ray/DVD/video files, click the Edit icon to enter the editing panel. Under Burn module, after loading source video files, click the Edit icon if you display loaded video in thumbnail or hit the Edit option on thumbnail if you display loaded video in detail to enter the editing panel. The Convert module and Burn module share the same editing panel. The below content would show you how to convert 2D to 3D within Leawo Prof. Media Ultra (with pictures snapped under Convert module).
Under 3D tab, you can slide the 3D Mode box to green and then select a 3D effect from Red/Cyan, Red/Green, Red/Blue, Blue/Yellow, Interleaved, and Side by Side to convert 2D to 3D. 3D Depth could also be adjusted from -50 to 50 for more vivid 3D movie effect.