This is a premium module, available with Customify Pro. You would need to activate the module from Appearance → Customify Options → WooCommerce Booster → Quick View.
The Quick View module adds a ‘quick view’ button to shop and archive product page that shows product details in a lightbox when clicked.
The modal window shows almost the product’s info, includes:
- Main featured image
- Gallery Slider
- Short description
- Quantity number
- Cart button
You can find the Quick View settings in Customize → WooCommerce → Product Catalog Designer → Product Quick View.