John, perhaps you should try the Topaz forum for a definitive answer, if you need it.
I use comparison view which gives four previews of the image with four different settings. I always ensure that Motion Blur is one of them as I find a Motion Blur setting frequently is the best but I do take moving objects. I rarely change the default 100% Zoom but move the Preview Window to a critical part of the image (e.g. eyes for a person).So the % figure has no particular meaning for me I just want to see which variation give a good result and Save Image then wait a long time with my slow underpowered PC.