diff --git a/library/components/legends/SemanticTreeLegend.vue b/library/components/legends/SemanticTreeLegend.vue
index fc92ae815..947da7d30 100644
--- a/library/components/legends/SemanticTreeLegend.vue
+++ b/library/components/legends/SemanticTreeLegend.vue
@@ -642,12 +642,15 @@ function numLocale() {
 }
 // ★ COMPACT IN THE READER'S NOTATION. This was `toFixed(1) + 'M'` / `+ 'k'`: English abbreviations with
 // an English decimal point on every Population cell in every locale. Intl's compact notation writes each
-// language's own form (ru "12,3 млн", de "12,3 Mio.", ar "12.3 مليون", zh "1234.6万") at the same
-// precision as before: one decimal for millions, whole thousands.
+// language's own form (ru "1,2 млн", de "1,2 Mio.", ar "1.2 مليون", zh "123.5万").
+// ⚠ SIZED TO THE COLUMN, which is fixed (--stl-num-w: 60px at 10.5px mono, 70px at 13px). The local forms are
+// longer than "12.3M": with one decimal everywhere de reached "123,5 Mio." (10 chars) — past both widths on
+// the region rows, whose sums run to hundreds of millions. So one decimal only below 10 million, where it
+// carries real information; whole units above. Worst case measured over all 11 locales: 8 Latin chars.
 function fmtPop(n) {
   if (!n) return '—'
   if (n >= 1e3) {
-    return new Intl.NumberFormat(numLocale(), { notation: 'compact', maximumFractionDigits: n >= 1e6 ? 1 : 0 }).format(n)
+    return new Intl.NumberFormat(numLocale(), { notation: 'compact', maximumFractionDigits: n >= 1e6 && n < 1e7 ? 1 : 0 }).format(n)
   }
   return n.toLocaleString(numLocale())
 }