Hello,

First of all, you should disable redirect to the shopping cart via WooCommerce -> Settings -> Products.

https://prnt.sc/t2ET2mIbyPYw

After that, navigate to Theme Settings -> Performance -> JS -> enable the “Magnific popup library”.

https://prnt.sc/PbEz6mWW6SXD

So at the end, the popup will appear.

Kind Regards