Before and after preview

Loving NLP but I miss the ability to compare my original image with my edited one to see how they compare and if it’s getting better or worse. Comparing the negative with the positive is pretty useless and creating a tiff happens after the conversion happens. It would be cool if there was a checkbox or something to allow for previewing the converted negative with and without any of the slide adjustments. The tone profile would of course stay the same but any of the adjustments made by slider would be turned off.
Thanks for reading!