How do I disable select/add to cart before choosing an option?

Hi,

How do I disable select/add to cart before choosing an option like colour, or size? By default, it lets you add the products in the builder without selecting any option, and when you click add to cart, the cart page shows the error “Please choose product options by visiting {Product Name and Url}”.

Try this out here: https://buildabridle.com/bridle-builder/
Let me know if you need admin access to check the backend.

It would be great to mistake-proof this for the users from the start so they don’t have to go back and have to choose everything all over again.

Thanks.