diff --git a/src/pages/XRSession.tsx b/src/pages/XRSession.tsx
index dd65883..4607bce 100644
--- a/src/pages/XRSession.tsx
+++ b/src/pages/XRSession.tsx
@@ -485,12 +485,15 @@ const XRSession = () => {
 
             {effectiveInXR ? (
               <>
-                {/* In XR (or SimXR): grab wrapper → ACTIVE model. Other models render as static background. */}
-                <XRBackgroundModels />
+                {/* In XR (or SimXR): all models share the same placement origin so
+                    switching active doesn't make others appear to "disappear".
+                    Only the ACTIVE model receives grab transforms. */}
                 {simXR ? (
                   <group position={[0, 1.0, -1.2]}>
+                    <XRBackgroundModels />
                     <XRGrabbable
                       allowScale={allowScale}
+                      lockedActive={isActiveLocked}
                       onGrabStart={() => { if (placementMode) setPlacementMode(false); }}
                     >
                       <XRActiveModel />
@@ -505,8 +508,10 @@ const XRSession = () => {
                       toast.success('Modelo posicionado na superfície!');
                     }}
                   >
+                    <XRBackgroundModels />
                     <XRGrabbable
                       allowScale={allowScale}
+                      lockedActive={isActiveLocked}
                       onGrabStart={() => { if (placementMode) setPlacementMode(false); }}
                     >
                       <XRActiveModel />