By default, Shopify collections only display the main products, not their variants. With the Flux theme, you can easily show Color and Size variants by simply ticking a checkbox.

To enable this feature:

1. Open the Theme Customizer and select a Collection template.
2. Choose the Product Grid section.
3. Within the section, find the “Product Card > Show product variants in the collection” checkbox and enable it.

Important: If a product variant doesn’t have an image set, the product’s main featured image will be used instead.