diff --git a/lidar_pipeline/tests/test_mapserve.py b/lidar_pipeline/tests/test_mapserve.py
index c087208..fa0a08f 100644
--- a/lidar_pipeline/tests/test_mapserve.py
+++ b/lidar_pipeline/tests/test_mapserve.py
@@ -1403,3 +1403,17 @@ def test_ui_single_tabbed_panel():
     assert "@media (max-width: 720px)" in _MAP_CSS and "#panel" in _MAP_CSS
     for state in ('data-sheet="closed"', 'data-sheet="half"', 'data-sheet="full"'):
         assert state.split('"')[1] in _MAP_CSS, state
+
+
+def test_ui_panel_restores_tab_and_ignores_collapse_on_phone():
+    from lidar_pipeline.mapui import _MAP_JS
+    render = _MAP_JS.split("function panelRender(")[1].split("\nfunction ")[0]
+    # Onglet choisi gardé à part : Génération rétablie une fois /api/status connu
+    assert "PANEL.want = PANEL.tab;" in _MAP_JS
+    assert "PANEL.tab = tabs.includes(PANEL.want) ? PANEL.want : 'view';" in render
+    assert "tab: PANEL.want" in _MAP_JS.split("function panelSave(")[1].split("\n")[0]
+    assert "PANEL.want = PANEL.tab = tab;" in _MAP_JS.split("function openTab(")[1].split("\nfunction ")[0]
+    # Repli en bande d'icônes : ordinateur seulement
+    assert "PANEL.collapsed && !isPhone()" in render
+    assert "toggle('collapsed', PANEL.collapsed)" not in render
+    assert "toggle('panel-collapsed', PANEL.collapsed)" not in render
diff --git a/lidar_pipeline/web/map.js b/lidar_pipeline/web/map.js
index 1886c0c..9809f04 100644
--- a/lidar_pipeline/web/map.js
+++ b/lidar_pipeline/web/map.js
@@ -1112,6 +1112,10 @@ document.addEventListener('panel:tab', (e) => {
 // --- panneau à onglets --------------------------------------------------------
 const PANEL_LS = 'lidar-panel';
 const PANEL = Object.assign({ tab: 'view', collapsed: false, sheet: 'half' }, lsGet(PANEL_LS, {}));
+// want = onglet choisi (mémorisé) ; tab = onglet affiché. Génération encore
+// inconnue au démarrage (api/status) : Affichage en attendant, puis l'onglet
+// choisi revient dès qu'il est proposé.
+PANEL.want = PANEL.tab;
 const phoneQuery = window.matchMedia('(max-width: 720px)');
 const isPhone = () => phoneQuery.matches;
 
@@ -1127,20 +1131,22 @@ function panelVisibleTab() {
   return PANEL.tab;
 }
 
-function panelSave() { lsSet(PANEL_LS, { tab: PANEL.tab, collapsed: PANEL.collapsed, sheet: PANEL.sheet }); }
+function panelSave() { lsSet(PANEL_LS, { tab: PANEL.want, collapsed: PANEL.collapsed, sheet: PANEL.sheet }); }
 
 function panelRender() {
   const tabs = panelTabs();
-  if (!tabs.includes(PANEL.tab)) PANEL.tab = 'view';
+  PANEL.tab = tabs.includes(PANEL.want) ? PANEL.want : 'view';
   el('panelTabs').querySelectorAll('button[data-tab]').forEach(b => {
     b.hidden = !tabs.includes(b.dataset.tab);
     b.setAttribute('aria-selected', String(b.dataset.tab === PANEL.tab));
   });
   for (const t of ['view', 'print', 'gen', 'share']) el('tab-' + t).hidden = t !== PANEL.tab;
   const panel = el('panel');
-  panel.classList.toggle('collapsed', PANEL.collapsed);
+  // Repli en bande d'icônes : ordinateur seulement (le téléphone a son volet).
+  const collapsed = PANEL.collapsed && !isPhone();
+  panel.classList.toggle('collapsed', collapsed);
   panel.dataset.sheet = PANEL.sheet;
-  document.body.classList.toggle('panel-collapsed', PANEL.collapsed);
+  document.body.classList.toggle('panel-collapsed', collapsed);
   // Hauteur couverte par le volet, que l'échelle, l'attribution et les messages
   // dégagent ; volet plein : la carte est cachée, rien à dégager (sinon ils
   // remonteraient en haut de l'écran, sur les outils).
@@ -1159,7 +1165,7 @@ function openTab(tab) {
     PANEL.sheet = 'half';
   }
   const resized = isPhone() && PANEL.sheet !== before;
-  PANEL.tab = tab;
+  PANEL.want = PANEL.tab = tab;
   PANEL.collapsed = false;
   panelSave(); panelRender();
   if (resized) setTimeout(panelRender, 220);   // hauteur finale après la transition CSS