layout.breakpoints

Container widths for each size class. Thresholds are inclusive, so a container exactly 640px wide is narrow. Breakpoints are normalized so tiny <= narrow <= compact always holds, whatever you pass; a class whose threshold equals the one above it is never selected.

new PDFViewer(container, doc, {
  layout: {
    breakpoints: { compact: 1024, narrow: 700, tiny: 520 },
  },
});