You can reset a 3D scene back to 2D. When you do this, the following changes are made to your scene:
Imported 3D models are removed.
3D camera movements are converted to 2D camera movements. Camera movements on the z-axis will be converted to 2D camera zoom-ins and zoom-outs, but 3D rotations will be ignored.
3D transformations on layers are converted to 2D transformations. Layers that have been moved on the z-axis will be scaled up or down to preserve their apparent proportions, but 3D rotations will be ignored.