Hello,

I saw the screenshot you attached. This feature is added in our latest update of the theme. You can have the quantity button for quick hover and standard button product style only.

You need to set the product style accordingly from Theme Settings >> Shop >> Product Styles.

Screenshot for Clarification: https://ibb.co/2Pc87SW

And please provide me with some relevant screenshots of how you want to extend the button to check it myself and help you out accordingly.

Best Regards.