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Drag your image anywhere in the top half of the window, and your depth map anywhere in the bottom half. A depth map is not required for this to work, but without one only image-based effects will function as expected.
Tab to toggle between preview and full-resolution.
B to show/hide window border. Please note that if the border is visible, the full-size image's height will be constrained to your monitor's size. Hide the border again and this will automatically be corrected.