diff --git a/library/layouts/pane-wrapper/pane-wrapper.js b/library/layouts/pane-wrapper/pane-wrapper.js
index 8cb5013ab..4d61c1ff2 100644
--- a/library/layouts/pane-wrapper/pane-wrapper.js
+++ b/library/layouts/pane-wrapper/pane-wrapper.js
@@ -172,9 +172,14 @@ export function buildPaneColumn(spec, { host, mountPane }) {
   return {
     panes: column,
     /** Animate to a pane by id — this is what the View fieldset tabs call. */
+    // ★ SCROLL THE COLUMN, NEVER THE PAGE. scrollIntoView() scrolls EVERY scrollable ancestor, the embedding
+    // page included: on another site, "Map" / "Show on map" moved the host's own page so the map's top met the
+    // window's top, and a host shorter than the window then showed its white space under the map. The column is
+    // the scroller (position:absolute; overflow-y:auto) and each pane's offsetParent, so its offsetTop is exactly
+    // the scroll position that puts the pane at the top.
     scrollTo(paneId) {
       const target = col.querySelector(`.pane[data-pane-id="${paneId}"]`)
-      if (target) target.scrollIntoView({ behavior: 'smooth', block: 'start' })
+      if (target) col.scrollTo({ top: target.offsetTop, behavior: 'smooth' })
     },
     /** Which pane is currently filling the viewport (for URL sync). */
     current() {