Hi,
Regarding the issue with the PDF invoice generation popup not closing on the frontend, it's something that we fixed recently:
www.hikashop.com/support/forum/orders-ma...download.html#165984
You can't just copy the layout of the non-PDF version to the PDF version because the library we use to convert the HTML to the PDF needs specific HTML and that is not compatible. That's why there is a specific PDF version, looking differently from the HTML version. If you need to modify the PDF version layout, you can edit the file plugins/hikashop/attachinvoice/attachinvoice/invoice.php There is no wysiwyg editor for it as it's not a view of HikaShop but a file of a plugin and Joomla doesn't have any system to override these.