diff --git a/plugin-designs/my-upg-100-list/upg-100-list.vue b/plugin-designs/my-upg-100-list/upg-100-list.vue
index 3ce4a92bf..2c2ec1ad2 100644
--- a/plugin-designs/my-upg-100-list/upg-100-list.vue
+++ b/plugin-designs/my-upg-100-list/upg-100-list.vue
@@ -271,14 +271,35 @@ const LEGEND_TITLE = 'My UPG 100 List — Legend'
 // by coincidence — the catalog means the ROP-2.5 sense, not this bundle's). Prefixed ids own no
 // catalog entry, so the labels below are what render. If these tabs are ever translated, add
 // `upg100Region`/`upg100Zone`/`upg100Group` to tabs.json rather than reusing a generic key.
+// ★ "Zone" RENAMED, ORDER DELIBERATELY UNCHANGED (2026-09-23).
+// Driver: "the user does not know what zones means" — the thing the map paints IS
+// a UPG-100 list (27 of them); "zone" was our internal word leaking into the UI.
+// So the LABEL now names what it shows. Region stays as what it actually is: a way
+// to SORT those lists by world area when you want that.
+//
+// ⚠ DO NOT REORDER THESE TO MAKE THE LIST TAB OPEN FIRST. Tab INDEX is coupled to
+// tree DEPTH in the shared legend: `activeTab = Math.min(sel.depth, …)` and again
+// on breadcrumb (SemanticTreeLegend ~231 and ~418). The tree nests region(0) →
+// zone(1) → group(2), so moving zone to index 0 would make selecting a zone jump
+// to the Region tab. Seven profiles share that component.
+// Opening on the list tab is done the way the codebase already provides for it:
+// `:default-tab="1"` at the call site — the prop country-posters added for exactly
+// this ("it opens to the country's semantic level in the legend").
+//
+// NOTE the warning above: these prefixed ids own no catalog entry, so THESE labels
+// are what render. If the packet is ever translated, add upg100Zone / upg100Region
+// / upg100Group to tabs.json rather than reusing a generic key.
 const LEGEND_TABS = [
   { id: 'upg100Region', label: 'Region',
-    info: 'Region — the broadest grouping, one row per world area (Africa, India, Middle East, Deaf, …). Counts are the UUPGs and population summed across every zone beneath it.' },
-  { id: 'upg100Zone',   label: 'Zone',
-    info: 'Zone — the prayer zones inside a region (e.g. Frontier Asia (uncovered) within Asia, or the Indian states within India). This is the level the map paints and colours.' },
+    info: 'Region — sort the UPG-100 lists by world area (Africa, India, Middle East, Deaf, …). Counts are the UUPGs and population summed across every list beneath it.' },
+  { id: 'upg100Zone',   label: 'UPG-100 Lists',
+    info: 'UPG-100 Lists — each one is a prayer list of the unreached people groups in an area, and is what the map paints and colours. Every list prints as its own packet.' },
   { id: 'upg100Group',  label: 'People Group',
-    info: 'People Group — the individual unreached groups inside a zone, largest prayer need first. Each map dot is one of these.' },
+    info: 'People Group — the individual unreached groups inside a list, largest prayer need first. Each map dot is one of these.' },
 ]
+// The generation the legend OPENS on: index 1 = the UPG-100 Lists tab. A reader
+// should meet the lists first and reach for Region only to sort them.
+const LEGEND_DEFAULT_TAB = 1
 
 const geocoderContext = 'people-groups' 
 const geocoderPlaceholder = 'Search people group, zone, or territory…'
@@ -1810,6 +1831,7 @@ onBeforeUnmount(() => {
         v-if="legendNodes.length"
         :nodes="legendNodes"
         :tabs="LEGEND_TABS"
+        :default-tab="LEGEND_DEFAULT_TAB"
         :columns="['count', 'pop']"
         :title="LEGEND_TITLE"
         :export-enabled="true"