There's an app at the Galaxy Store, Samsung's app store, called Edge Lighting. It may give you more control over the settings for it but as far as I know it's all or nothing with edge lighting. I've seen one other similar complaint/question and I'm almost certain the answer was all or nothing.
Alternatively you could try changing the color to one that isn't so bothersome or turn it off and use the accessibility setting that fires the flash for notifications. I think it's under hearing impairment settings.