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I have several of the Topaz AI products (DeNoise, Sharpen, & GigaPixel).  Both DeNoise & Sharpen have an option where you can turn the automatic update or refresh so that the preview remains unchanged until you finish your adjustments and then manually click to update/refresh.  I see no such option on GigaPixel however.  I think I've looked everywhere but cannot find anything.  Does anyone know if this option exists for GigaPixel?

That option wouldn't make sense for AI Gigapixel since it is resizing the image, it has to rerender it. With the others, your image size is staying the same so you can hold off on actually displaying the effect of the tool until you decide.