You can customize the design of the QR code markers as follows:
1. Change the size of the printed marker sheet and the size of the actual QR size marker
2. Add images (logos) to the top, left and bottom areas of the marker
3. Add a banner to the bottom of the marker
4. Add a background image to the marker
Please watch this video where we changed the marker size, added a top logo and a background image as example.