Sydney Pro has built-in functionality for the quick view button. This means your visitors will be able to click a button on your product archives for a specific product and immediately see a popup with that product’s information, as well as its add to cart button.
To enable the quick view button, please go to Customize > Product Catalog and find the Product card item and click on it as shown in the following image:
Once you’ve expanded Product card, scroll down to find the Quick View layout option, from which you can disable the quick view (the first option) or set your preferred position for it. Please keep in mind that the quick view button is only shown when an user hovers over your products.