diff --git a/static/style.css b/static/style.css
index 2d1291ba..aba495c1 100644
--- a/static/style.css
+++ b/static/style.css
@@ -206,6 +206,11 @@ body.builderBody > main.content{ flex:1 1 auto; min-height:0; overflow:hidden; d
 .floatPanel--left{ left:24px; width:280px; }
 .floatPanel--right{ right:24px; width:340px; }
 .floatPanel--center{ left:50%; width:560px; max-width:calc(100vw - 48px); transform:translateX(-50%); }
+/* Plein écran (voir makeFloatPanelFullscreenable() dans game_dashboard.html)
+   — juste un repère visuel (bordure accent) sur le panneau agrandi, tout le
+   positionnement réel est posé directement en style inline par le JS (pour
+   pouvoir revenir exactement à la position/taille d'avant en sortant). */
+.floatPanel--fullscreen{ border-color:var(--accent); }
 .floatPanelHeader{
   display:flex; align-items:center; justify-content:space-between; gap:8px;
   padding:8px 10px; border-bottom:1px solid var(--border); background:var(--panel2);
diff --git a/templates/game_dashboard.html b/templates/game_dashboard.html
index d780eaf8..d625dac0 100644
--- a/templates/game_dashboard.html
+++ b/templates/game_dashboard.html
@@ -221,6 +221,7 @@
 <div class="floatPanel floatPanel--center hidden" id="newObjectPanel">
   <div class="floatPanelHeader" id="newObjectPanelHeader">
     <span class="floatPanelTitle">⋮⋮ Nouvel objet</span>
+    <button type="button" class="button is-small floatPanelFullscreenBtn" title="Plein écran">⛶</button>
     <button type="button" class="button is-small" onclick="closeNewObjectPanel()">✕</button>
   </div>
   <div class="floatPanelBody">
@@ -261,6 +262,7 @@
 <div class="floatPanel floatPanel--center hidden objectEditPanel" data-definition-id="{{ d.id }}" id="objectEditPanel-{{ d.id }}">
   <div class="floatPanelHeader">
     <span class="floatPanelTitle">⋮⋮ {{ definition.name }}</span>
+    <button type="button" class="button is-small floatPanelFullscreenBtn" title="Plein écran">⛶</button>
     <button type="button" class="button is-small" onclick="closeObjectEditPanel({{ d.id }})">✕</button>
   </div>
   <div class="floatPanelBody">
@@ -458,6 +460,7 @@
 <div class="floatPanel floatPanel--center hidden addFieldPanel" data-definition-id="{{ d.id }}" id="addFieldPanel-{{ d.id }}">
   <div class="floatPanelHeader">
     <span class="floatPanelTitle">⋮⋮ Ajouter un champ — {{ definition.name }}</span>
+    <button type="button" class="button is-small floatPanelFullscreenBtn" title="Plein écran">⛶</button>
     <button type="button" class="button is-small" onclick="closeAddFieldPanel({{ d.id }})">✕</button>
   </div>
   <div class="floatPanelBody">
@@ -509,6 +512,7 @@
 <div class="floatPanel floatPanel--center hidden addEntryPanel" data-definition-id="{{ d.id }}" id="addEntryPanel-{{ d.id }}">
   <div class="floatPanelHeader">
     <span class="floatPanelTitle">⋮⋮ Ajouter une entrée — {{ definition.name }}</span>
+    <button type="button" class="button is-small floatPanelFullscreenBtn" title="Plein écran">⛶</button>
     <button type="button" class="button is-small" onclick="closeAddEntryPanel({{ d.id }})">✕</button>
   </div>
   <div class="floatPanelBody">
@@ -628,10 +632,15 @@ function makeFloatPanelDraggable(panel, header) {
   header.addEventListener('mousedown', function (e) {
     if (e.target.closest('button')) return;
     dragging = true;
+    // Glisser un panneau en plein écran doit d'abord l'en faire sortir —
+    // sinon left/top posés juste en dessous seraient aussitôt repris en
+    // main par bottom/right encore actifs (voir makeFloatPanelFullscreenable).
+    if (panel.classList.contains('floatPanel--fullscreen')) panel._fsToggle.exit();
     var rect = panel.getBoundingClientRect();
     panel.style.left = rect.left + 'px';
     panel.style.top = rect.top + 'px';
     panel.style.right = 'auto';
+    panel.style.bottom = 'auto';
     panel.style.transform = 'none';
     offsetX = e.clientX - rect.left;
     offsetY = e.clientY - rect.top;
@@ -651,6 +660,10 @@ function makeFloatPanelResizable(panel, handle) {
   var resizing = false, startX = 0, startY = 0, startW = 0, startH = 0;
   handle.addEventListener('mousedown', function (e) {
     resizing = true;
+    // Même remarque que pour le glisser-déposer : sortir du plein écran
+    // d'abord, sinon bottom/right encore actifs reprendraient la main sur
+    // la largeur/hauteur posées ci-dessous.
+    if (panel.classList.contains('floatPanel--fullscreen')) panel._fsToggle.exit();
     var rect = panel.getBoundingClientRect();
     startX = e.clientX; startY = e.clientY;
     startW = rect.width; startH = rect.height;
@@ -673,13 +686,50 @@ function makeFloatPanelResizable(panel, handle) {
     document.body.style.userSelect = '';
   });
 }
+// Plein écran (voir switchDashTab pour l'esprit général : chaque panneau
+// s'ouvre en plein écran par défaut — plus pratique dès qu'il y a plus de
+// quelques champs — avec un bouton pour revenir à sa taille/position
+// précédente, mémorisée le temps de la session (pas persistée). Renvoie un
+// objet {enter, exit} et pose panel._fsToggle dessus, pour que le code qui
+// OUVRE le panneau (openXxxPanel ci-dessous) puisse appeler enter() sans
+// avoir à re-chercher le bouton.
+function makeFloatPanelFullscreenable(panel, toggleBtn) {
+  var saved = null;
+  function enter() {
+    saved = {
+      left: panel.style.left, top: panel.style.top, right: panel.style.right,
+      width: panel.style.width, height: panel.style.height,
+      maxWidth: panel.style.maxWidth, transform: panel.style.transform,
+    };
+    panel.classList.add('floatPanel--fullscreen');
+    panel.style.left = '12px'; panel.style.top = '12px'; panel.style.right = '12px'; panel.style.bottom = '12px';
+    panel.style.width = 'auto'; panel.style.height = 'auto'; panel.style.maxWidth = 'none'; panel.style.transform = 'none';
+    toggleBtn.title = 'Quitter le plein écran';
+  }
+  function exit() {
+    panel.classList.remove('floatPanel--fullscreen');
+    panel.style.bottom = '';
+    if (saved) {
+      panel.style.left = saved.left; panel.style.top = saved.top; panel.style.right = saved.right;
+      panel.style.width = saved.width; panel.style.height = saved.height;
+      panel.style.maxWidth = saved.maxWidth; panel.style.transform = saved.transform;
+    }
+    toggleBtn.title = 'Plein écran';
+  }
+  toggleBtn.addEventListener('click', function () {
+    if (panel.classList.contains('floatPanel--fullscreen')) exit(); else enter();
+  });
+  panel._fsToggle = { enter: enter, exit: exit };
+  return panel._fsToggle;
+}
 
 // ---------- Panneau déplaçable "Nouvel objet" ----------
 (function () {
   var panel = document.getElementById('newObjectPanel');
   makeFloatPanelDraggable(panel, document.getElementById('newObjectPanelHeader'));
   makeFloatPanelResizable(panel, document.getElementById('newObjectPanelResizeHandle'));
-  window.openNewObjectPanel = function () { panel.classList.remove('hidden'); };
+  makeFloatPanelFullscreenable(panel, panel.querySelector('.floatPanelFullscreenBtn'));
+  window.openNewObjectPanel = function () { panel.classList.remove('hidden'); panel._fsToggle.enter(); };
   window.closeNewObjectPanel = function () { panel.classList.add('hidden'); };
 })();
 
@@ -688,10 +738,13 @@ function makeFloatPanelResizable(panel, handle) {
   document.querySelectorAll('.objectEditPanel').forEach(function (panel) {
     makeFloatPanelDraggable(panel, panel.querySelector('.floatPanelHeader'));
     makeFloatPanelResizable(panel, panel.querySelector('.floatPanelResizeHandle'));
+    makeFloatPanelFullscreenable(panel, panel.querySelector('.floatPanelFullscreenBtn'));
   });
   window.openObjectEditPanel = function (definitionId, subtab) {
     document.querySelectorAll('.objectEditPanel').forEach(function (panel) {
-      panel.classList.toggle('hidden', panel.dataset.definitionId !== String(definitionId));
+      var isTarget = panel.dataset.definitionId === String(definitionId);
+      panel.classList.toggle('hidden', !isTarget);
+      if (isTarget) panel._fsToggle.enter();
     });
     if (subtab) {
       var panel = document.querySelector('.objectEditPanel[data-definition-id="' + definitionId + '"]');
@@ -725,6 +778,7 @@ function makeFloatPanelResizable(panel, handle) {
   document.querySelectorAll('.addFieldPanel').forEach(function (panel) {
     makeFloatPanelDraggable(panel, panel.querySelector('.floatPanelHeader'));
     makeFloatPanelResizable(panel, panel.querySelector('.floatPanelResizeHandle'));
+    makeFloatPanelFullscreenable(panel, panel.querySelector('.floatPanelFullscreenBtn'));
 
     var typeSelect = panel.querySelector('.fieldTypeSelect');
     var relationTarget = panel.querySelector('.relationTarget');
@@ -739,11 +793,12 @@ function makeFloatPanelResizable(panel, handle) {
   document.querySelectorAll('.addEntryPanel').forEach(function (panel) {
     makeFloatPanelDraggable(panel, panel.querySelector('.floatPanelHeader'));
     makeFloatPanelResizable(panel, panel.querySelector('.floatPanelResizeHandle'));
+    makeFloatPanelFullscreenable(panel, panel.querySelector('.floatPanelFullscreenBtn'));
   });
 
   window.openAddFieldPanel = function (definitionId) {
     var panel = document.querySelector('.addFieldPanel[data-definition-id="' + definitionId + '"]');
-    if (panel) panel.classList.remove('hidden');
+    if (panel) { panel.classList.remove('hidden'); panel._fsToggle.enter(); }
   };
   window.closeAddFieldPanel = function (definitionId) {
     var panel = document.querySelector('.addFieldPanel[data-definition-id="' + definitionId + '"]');
@@ -751,7 +806,7 @@ function makeFloatPanelResizable(panel, handle) {
   };
   window.openAddEntryPanel = function (definitionId) {
     var panel = document.querySelector('.addEntryPanel[data-definition-id="' + definitionId + '"]');
-    if (panel) panel.classList.remove('hidden');
+    if (panel) { panel.classList.remove('hidden'); panel._fsToggle.enter(); }
   };
   window.closeAddEntryPanel = function (definitionId) {
     var panel = document.querySelector('.addEntryPanel[data-definition-id="' + definitionId + '"]');