Hello,
In the Vegetables demo, the product grid is built using the Loop Item Builder, which is why its product layout and hover behavior differ from the default product loop styles.
To achieve a similar layout, you can either:
Use the Loop Item Builder to create and customize the product loop according to your requirements:
Here is the documentation: https://xtemos.com/docs-topic/product-loop-item-layout-builder/
Or navigate to Theme Settings > Product Archive > Product Loop and select a product style that supports the quantity selector.
Best Regards