Each row is one metric on one honest scale: compare units left to right. Each column is one unit top to bottom. Europe's margin erosion is unmissable because the whole Margin row shares its domain, and no axis pretends dollars and percent are the same thing.
scales.y: 'independent-row' computes ONE domain per row (the
union across that row's panels) so ticks are identical along a row and
different across rows; the y labels draw on the first column only,
because the row's left edge speaks for the whole row. Per-row units come
from trellis.panel: the Margin row formats as percent, the
Revenue row as dollars. The grid stays pixel-aligned across rows via the
measured shared gutter. Trellis is a premium feature; without a license
it renders with a trial watermark.