How to trigger the side cart drawer when I click on the ATC button on my page

Folks - on one of our pages, when we click on add to cart, it redirects to the default shopify theme cart instead of the side cart (that opens up when we choose ATC on any other product on the website).
How do we get ATC on this page - India's Finest Masala Chai to show side cart? I checked with the cart support team and their answer is below:

You can choose to “Add a product to the cart” and not go to cart or checkout page after. I recorded a loom showing this -

We also have a good documentation on how to set it up.