If I change the PDF of the QR Code, would the QR Code design change?

No, if you change the PDF of the QR code, the QR code design will not change. PDF QR codes are dynamic, meaning they retain their appearance even if the linked content is edited. If you wish to alter the design of your QR code, you'll need to access the design options by clicking on the palette icon from your dashboard. This will allow you to customize the appearance of the QR code without affecting the linked content.