Hey @wtony,
I checked and tested and it’s not possible to make the columns scroll horizontally without custom development. It’s also not possible in Slider Revolution either.
I would recommend that you use Slider Revolution for this though. You don’t get a horizontal scrollbar but you have a touch enabled horizontal scrolling. Having the nav arrows is also essential for UX to indicate that you can scroll left and right. For usage instructions, please see https://www.themepunch.com/revslider-doc/slider-revolution-documentation/
If you’re using Pro and if you can display your gallery above the fold, I’d recommend adding your images in the Pro Header because you can enable the Bar’s Content Scrolling. See https://youtu.be/GP8kWOOomfY
If you’re still interested to achieve this in Cornerstone, I’ll show you a way but please note that this is outside the scope of our support. This should serve only as a guide. We will not support issues that might arise from the use of the guide or further enhancements. Please see https://youtu.be/l5ma6z5rbNg
Thanks.