I was trying to find a similar problem in the community but wasn't able to. I'm using Brooklyn theme.
Our team is facing a problem related to the variant selection. By default, the very first variant is selected when the product page gets opened. This creates a huge problem because some customers forget to choose the size. Therefore, they purchase the very first variant. Is there way to remove the default selection and force the customer to make a selection before proceeding to the cart? Here is the link to the product page.
We tried to install the "WARNING" message but it doesn't work well. It would be better to fix the root of the problem.
I appreciate everyone's feedback into this discussion. Stay safe