Unfortunately, we won’t be able to provide the customized code to modify plugin styling for the Add to Cart button to display above the Product Add-ons containers.?
If you are interested in making any modifications to the product page styling, you would need to make code modifications on the plugin files directly. You can find the code for the product page at the Product Add-ons plugin directory location of /includes/Frontend/Product.php, starting on line 37 you will see the code referenced to display styling of the add-on options and Add to Cart functions.??
I hope this information is helpful in making customized layout modifications with the plugin and your theme. If you are not a developer, we’d recommend you consult with a developer before making any code modifications to the theme or plugin.?