Magento2 Configurable Preselect extension helps your customers to add the product to cart with the selected attributes in a single click, and it is benefited in customers experience. Default Magento does not display any combination of configurable products. For example, if a configurable product has two options like size and color, customers can get confused about the most appropriate combination.
Lily
Quite easy to use, nice design, surely will buy again for my another store