To enable/disable the soft add to cart, head over to Settings > Cart.
What is this?
The soft add to cart saves customers time and makes their shopping experience more efficient and hassle free. By enabling the soft add to cart, a customer will be presented with a full breakdown of the product at which point they can proceed to checkout as opposed to viewing the full product and then going to checkout.
Once you have turned the feature on, customers that start adding products to the cart will be presented with the popup box (below image). The customer will then have a choice to continue shopping or go through to the checkout process.