Win 8.1 Quick Launch - How to remove lines between icons?

Hi,

I have been tweaking my Win 8.1 - Classic Shell, etc. trying to get it how I like it.

I have a theme I like but when I apply it, it places lines between my Quick Launch items. I want to know where to find a setting to remove these lines.

Any help much appreciated!

Please see pic below:

Thanks,
Lalo