To compare the results of your image editing with the untouched original, double click the image. Your image is displayed in its before, split, and edited view. Move between the views by clicking the labeled tabs at the bottom. In split view, a divider shows the original on one side and the edited on the other.

Drag the divider back and forth over the image to see all parts. Click on the “Switch Split Image Display” button in the Image Viewer Menu Bar to toggle the display between horizontal and vertical splits, with the edited image appearing either at the right, bottom, left, or top. Your last split-image setting is retained when the image viewer is closed.