Hello,
I saw the screenshot you attached. To display swatches on the product grid you need to use the attributes as variations and set prices for each variation from the edit product.
Then you need to Go to Products >> Attributes >> Configure Items >> And set the option for each item.
Screenshot for Clarification: https://ibb.co/vw44scF
Then navigate to Theme Settings >> Shop >> Attribute Swatches. And set the swatches to be displayed on the product grids.
Screenshot for Clarification: https://ibb.co/MnJ8WhF
You can read our detailed documentation in the following link:
https://xtemos.com/docs/woodmart/variable-products-swatches/
Best Regards.