salix/print/templates/reports/collection-label/options.json

{
    "width": "10.4cm",
    "height": "4.9cm",
    "margin": {
        "top": "0.3cm",
        "right": "0.3cm",
        "bottom": "0cm",
        "left": "0.2cm"
    },
    "printBackground": true
}