Which of the following is not required in your theme.liquid file for submission to the theme store?

The inclusion of custom color settings for social icons in your theme.liquid file is not a requirement for submission to the Shopify theme store. While visual customization is important for themes, Shopify sets specific guidelines that primarily focus on the functionality, navigation, and usability features that contribute to an optimal user experience.

Requirements such as having a search box or a link to the search page in either the header or footer, displaying logos for methods of payment, and ensuring main navigation focus states are critical components that enhance the functionality and accessibility of the theme. These elements help ensure that users can navigate easily and understand the payment options available, which are essential to a complete and professional shopping experience.

In contrast, custom color settings for social icons, while they may enhance aesthetics, do not directly impact the core navigational or functional aspects that Shopify prioritizes in its theme store review. Therefore, this option is correctly identified as not required for submission.