Page count and trim in; exact Canva canvas, bleed, spine, fold lines, safe areas and barcode zone out. Exports an SVG guide layer at the exact pixel size — import it into Canva as the bottom layer, design over it, delete it before export.
Book
The numbers
Preview
bleed edge (canvas)trimspine foldssafe areabarcode zone
All six regions at these settings
Spine and canvas recompute from the paper and trim above. Get the page count final before the cover — the spine moves if it changes.