In the category called "Print QR-code" you will find a field called "Page Size" and a button called "Print" (see image below).

 

Using the field called "Page Size" and the button called "Print", you can create a QR code for the building you are working with. When you create a QR code for a building, the QR code will be shown as a pdf document. The pdf document with the QR code can then be printed and saved on your computer.