diff --git a/frontend/components/admin/dashboard/widgets/yard-3d/DigitalTwinViewer.tsx b/frontend/components/admin/dashboard/widgets/yard-3d/DigitalTwinViewer.tsx
index 8d4bdfd1..7e0986a3 100644
--- a/frontend/components/admin/dashboard/widgets/yard-3d/DigitalTwinViewer.tsx
+++ b/frontend/components/admin/dashboard/widgets/yard-3d/DigitalTwinViewer.tsx
@@ -50,6 +50,7 @@ export default function DigitalTwinViewer({ layoutId }: DigitalTwinViewerProps)
   // 외부 업체 모드
   const [isExternalMode, setIsExternalMode] = useState(false);
   const [isFullscreen, setIsFullscreen] = useState(false);
+  const [layoutKey, setLayoutKey] = useState(0); // 레이아웃 강제 리렌더링용
   const canvasContainerRef = useRef<HTMLDivElement>(null);
 
   // 외부 업체 역할 체크
@@ -98,7 +99,16 @@ export default function DigitalTwinViewer({ layoutId }: DigitalTwinViewerProps)
   // 전체 화면 변경 감지
   useEffect(() => {
     const handleFullscreenChange = () => {
-      setIsFullscreen(!!document.fullscreenElement);
+      const isNowFullscreen = !!document.fullscreenElement;
+      setIsFullscreen(isNowFullscreen);
+      
+      // 전체화면 종료 시 레이아웃 강제 리렌더링
+      if (!isNowFullscreen) {
+        setTimeout(() => {
+          setLayoutKey(prev => prev + 1);
+          window.dispatchEvent(new Event('resize'));
+        }, 50);
+      }
     };
 
     document.addEventListener("fullscreenchange", handleFullscreenChange);
@@ -262,7 +272,8 @@ export default function DigitalTwinViewer({ layoutId }: DigitalTwinViewerProps)
       });
       if (response.success && response.data) {
         const layerColumn = hierarchyConfig.material.layerColumn || "LOLAYER";
-        const sortedMaterials = response.data.sort((a: any, b: any) => (a[layerColumn] || 0) - (b[layerColumn] || 0));
+        // 층 내림차순 정렬 (높은 층이 위로)
+        const sortedMaterials = response.data.sort((a: any, b: any) => (b[layerColumn] || 0) - (a[layerColumn] || 0));
         setMaterials(sortedMaterials);
       } else {
         setMaterials([]);
@@ -660,37 +671,26 @@ export default function DigitalTwinViewer({ layoutId }: DigitalTwinViewerProps)
         </div>
         )}
 
-        {/* 중앙: 3D 캔버스 */}
+        {/* 중앙 + 우측 컨테이너 (전체화면 시 함께 표시) */}
         <div 
           ref={canvasContainerRef}
-          className={`relative flex-1 ${isFullscreen ? "bg-background" : ""}`}
+          className={`relative flex flex-1 overflow-hidden ${isFullscreen ? "bg-background" : ""}`}
         >
-          {!isLoading && (
-            <Yard3DCanvas
-              placements={canvasPlacements}
-              selectedPlacementId={selectedObject?.id || null}
-              onPlacementClick={(placement) => handleObjectClick(placement?.id || null)}
-              focusOnPlacementId={null}
-              onCollisionDetected={() => {}}
-            />
-          )}
-          {/* 풀스크린 모드일 때 종료 버튼 */}
-          {isFullscreen && (
-            <Button
-              variant="outline"
-              size="sm"
-              onClick={toggleFullscreen}
-              className="absolute top-4 right-4 z-50 bg-background/80 backdrop-blur-sm"
-            >
-              <Minimize className="mr-2 h-4 w-4" />
-              종료
-            </Button>
-          )}
-        </div>
+          {/* 중앙: 3D 캔버스 */}
+          <div className="relative min-w-0 flex-1">
+            {!isLoading && (
+              <Yard3DCanvas
+                placements={canvasPlacements}
+                selectedPlacementId={selectedObject?.id || null}
+                onPlacementClick={(placement) => handleObjectClick(placement?.id || null)}
+                focusOnPlacementId={null}
+                onCollisionDetected={() => {}}
+              />
+            )}
+          </div>
 
-        {/* 우측: 정보 패널 - 외부 모드에서는 숨김 */}
-        {!isExternalMode && (
-        <div className="h-full w-[480px] flex-shrink-0 overflow-y-auto border-l">
+          {/* 우측: 정보 패널 */}
+          <div className="h-full w-[480px] min-w-[480px] flex-shrink-0 overflow-y-auto border-l">
           {selectedObject ? (
             <div className="p-4">
               <div className="mb-4">
@@ -792,8 +792,21 @@ export default function DigitalTwinViewer({ layoutId }: DigitalTwinViewerProps)
               <p className="text-muted-foreground text-sm">객체를 선택하세요</p>
             </div>
           )}
+          </div>
+
+          {/* 풀스크린 모드일 때 종료 버튼 */}
+          {isFullscreen && (
+            <Button
+              variant="outline"
+              size="sm"
+              onClick={toggleFullscreen}
+              className="absolute top-4 right-4 z-50 bg-background/80 backdrop-blur-sm"
+            >
+              <Minimize className="mr-2 h-4 w-4" />
+              종료
+            </Button>
+          )}
         </div>
-        )}
       </div>
     </div>
   );