Thanks for using our theme.
Single Product Builder is activated on your site? If so, go to Theme Options > Woocommerce > Single product builder > Add to cart & quantity > Min Height (Px)
Where exactly do you want to add the divider? Provide a screenshot for a better understanding the desired result. Use the Lightshot screenshot tool to share screenshots.
You can try to use border – https://prnt.sc/wgmxqz https://prnt.sc/wgmys2
One standard license is valid only for 1 project. Running multiple projects on a single license is a copyright violation.