How can I show Signle Attribute in Shop/ Archive Page?
To enable single attribute navigate to WordPress admin menu WooCommerce => Settings => Product Swatches=> Archive/ Shop
Then see Special Attributes
Special Attribute
First check Show single attribute on archive page then select the attribute and set display event lie on click or on hover.
Attribute display limit if set a number here like 3 then if a product has then then 3 attributes then it will show more link.