diff --git a/B07_DesignDetail/openwebcad/src/App.css b/B07_DesignDetail/openwebcad/src/App.css
index 62b2b8d4..84797833 100644
--- a/B07_DesignDetail/openwebcad/src/App.css
+++ b/B07_DesignDetail/openwebcad/src/App.css
@@ -151,6 +151,12 @@ body > canvas[data-id="canvas"] {
 	border-bottom: 1px solid var(--cad-line);
 	transition: height 120ms ease;
 }
+/* 접힘 모드에서 탭으로 잠깐 펼침 — 도면 자리는 그대로 두고 위에 겹쳐 뜸(122px = 펼친 리본 높이) */
+.cad-ribbon[data-peek="true"] {
+	z-index: 10;
+	height: 122px;
+	box-shadow: var(--shadow-lg);
+}
 .cad-ribbon-tabs {
 	display: flex;
 	gap: 2px;
diff --git a/B07_DesignDetail/openwebcad/src/components/Toolbar.tsx b/B07_DesignDetail/openwebcad/src/components/Toolbar.tsx
index 426d4bbf..67e6dc26 100644
--- a/B07_DesignDetail/openwebcad/src/components/Toolbar.tsx
+++ b/B07_DesignDetail/openwebcad/src/components/Toolbar.tsx
@@ -12,7 +12,7 @@ import { QuickAccessBar } from './QuickAccessBar';
 import { Ribbon } from '../ribbon/Ribbon';
 import { StatusBar } from './StatusBar';
 import { useCadRefresh } from './use-cad-refresh';
-import { isRibbonCollapsed } from './ui-state';
+import { isInspectorCollapsed, isRibbonCollapsed, setInspectorCollapsed } from './ui-state';
 import { getActiveToolActor } from '../state';
 import type { Tool } from '../tools';
 import { ViewControls } from './ViewControls';
@@ -20,11 +20,12 @@ import { DropHint } from './DropHint';
 
 export const Toolbar: FC = () => {
 	useCadRefresh();
-	const [panelCollapsed, setPanelCollapsed] = useState(false);
 	const [commandLineVisible, setCommandLineVisible] = useState(false);
 
 	const activeTool = (getActiveToolActor()?.getSnapshot()?.context?.type ?? null) as Tool | null;
 	const ribbonCollapsed = isRibbonCollapsed();
+	// 좌측 패널 접힘 — 호스트(M02 미리보기)가 접힌 채로 실을 수 있게 ui-state 에 둔다
+	const panelCollapsed = isInspectorCollapsed();
 
 	useEffect(() => {
 		// 편 상태의 폭은 App.css의 `--cad-panel-width` 기본값을 쓴다. 여기 숫자를 박아
@@ -54,7 +55,7 @@ export const Toolbar: FC = () => {
 			/>
 			<InspectorPanel
 				collapsed={panelCollapsed}
-				onToggleCollapsed={() => setPanelCollapsed((value) => !value)}
+				onToggleCollapsed={() => setInspectorCollapsed(!panelCollapsed)}
 			/>
 			<ViewControls />
 			<DropHint />
diff --git a/B07_DesignDetail/openwebcad/src/integration/aislo-drawing-bridge.ts b/B07_DesignDetail/openwebcad/src/integration/aislo-drawing-bridge.ts
index b42e3130..6eef848b 100644
--- a/B07_DesignDetail/openwebcad/src/integration/aislo-drawing-bridge.ts
+++ b/B07_DesignDetail/openwebcad/src/integration/aislo-drawing-bridge.ts
@@ -25,7 +25,7 @@ import {
 	setHostTitle,
 	setLayers,
 } from '../state.ts';
-import { setRibbonCollapsed } from '../components/ui-state.ts';
+import { setInspectorCollapsed, setRibbonCollapsed } from '../components/ui-state.ts';
 import { toast } from 'react-toastify';
 import { runCommandInput } from '../commands/run-command.ts';
 import { setRecoveryScope } from '../helpers/autosave.ts';
@@ -60,6 +60,8 @@ interface DrawingLoadMessage {
 	hostSave?: boolean;
 	/** 리본을 접힌 채로 여는가 — 없으면(B07) 펼침 그대로. */
 	ribbonCollapsed?: boolean;
+	/** 좌측 패널(특성 · 도면층)을 접힌 채로 여는가 — 없으면(B07) 지금 상태 그대로. */
+	panelsCollapsed?: boolean;
 }
 
 interface DrawingSaveRequestMessage {
@@ -211,6 +213,7 @@ export function registerAisloDrawingBridge() {
 			setHostTitle(event.data.hostTitle ?? 'B07 상세 설계');
 			setHostSave(event.data.hostSave === true);
 			setRibbonCollapsed(event.data.ribbonCollapsed === true);
+			if (event.data.panelsCollapsed) setInspectorCollapsed(true);
 			if (event.data.frameEdit) applyFramePreview();
 			// 앞 도면에서 켜 둔 그리기 도구를 내린다. 안 내리면 **확정한 도면 위에도**
 			// 그 도구가 계속 그린다 — 읽기 전용은 새 명령만 막기 때문이다(2026-09-01 실측:
diff --git a/B07_DesignDetail/openwebcad/src/ribbon/Ribbon.tsx b/B07_DesignDetail/openwebcad/src/ribbon/Ribbon.tsx
index b46d3c77..4afe48c3 100644
--- a/B07_DesignDetail/openwebcad/src/ribbon/Ribbon.tsx
+++ b/B07_DesignDetail/openwebcad/src/ribbon/Ribbon.tsx
@@ -153,6 +153,20 @@ export const Ribbon: FC<RibbonProps> = ({ activeTool, widgets, onCommandRun }) =
 	const activeTabId = getActiveRibbonTab();
 	const activeTab = RIBBON_TABS.find((tab) => tab.id === activeTabId) ?? RIBBON_TABS[0];
 	const collapsed = isRibbonCollapsed();
+	// 접힘 모드에서 탭을 누르면 잠깐 펼침(도면 위에 겹쳐 뜸) — 리본 밖을 누르면 다시 접힘
+	// (오피스 「리본 자동 숨기기」). 접기 단추로 펼치면 고정 펼침.
+	const [peek, setPeek] = useState(false);
+	const navRef = useRef<HTMLElement>(null);
+	const peeking = collapsed && peek;
+
+	useEffect(() => {
+		if (!peeking) return;
+		const close = (event: PointerEvent) => {
+			if (!navRef.current?.contains(event.target as Node)) setPeek(false);
+		};
+		window.addEventListener('pointerdown', close, true);
+		return () => window.removeEventListener('pointerdown', close, true);
+	}, [peeking]);
 
 	const handleRun = (command: CadCommand) => {
 		runCommand(command);
@@ -160,7 +174,7 @@ export const Ribbon: FC<RibbonProps> = ({ activeTool, widgets, onCommandRun }) =
 	};
 
 	return (
-		<nav className="cad-ribbon controls" aria-label="CAD 리본">
+		<nav ref={navRef} className="cad-ribbon controls" aria-label="CAD 리본" data-peek={peeking}>
 			<div className="cad-ribbon-tabs">
 				{RIBBON_TABS.map((tab) => (
 					<button
@@ -169,7 +183,7 @@ export const Ribbon: FC<RibbonProps> = ({ activeTool, widgets, onCommandRun }) =
 						data-active={tab.id === activeTab.id}
 						onClick={() => {
 							setActiveRibbonTab(tab.id);
-							if (collapsed) setRibbonCollapsed(false);
+							if (collapsed) setPeek(true);
 						}}
 					>
 						{tab.label}
@@ -178,13 +192,16 @@ export const Ribbon: FC<RibbonProps> = ({ activeTool, widgets, onCommandRun }) =
 				<button
 					type="button"
 					className="cad-ribbon-tabs__collapse"
-					onClick={() => setRibbonCollapsed(!collapsed)}
+					onClick={() => {
+						setPeek(false);
+						setRibbonCollapsed(!collapsed);
+					}}
 					title={collapsed ? '리본 펼치기' : '리본 접기'}
 				>
 					{collapsed ? '⌄' : '⌃'}
 				</button>
 			</div>
-			{!collapsed && (
+			{(!collapsed || peeking) && (
 				<div className="cad-ribbon-panels">
 					{activeTab.panels.map((panel) => (
 						<Panel
diff --git a/M02_MasterTemplete/M02_MasterTemplete_Drawing.ts b/M02_MasterTemplete/M02_MasterTemplete_Drawing.ts
index 6c0bec41..7bc676b3 100644
--- a/M02_MasterTemplete/M02_MasterTemplete_Drawing.ts
+++ b/M02_MasterTemplete/M02_MasterTemplete_Drawing.ts
@@ -39,6 +39,8 @@ export interface DrawingTemplateOptions {
   onChanged?: (dirty: boolean) => void;
   /** 페이지 제목 줄 안의 빈 칸 — 있으면 작도 영역 칸 · 파일 불러오기를 거기 한 줄로 놓는다. */
   headerSlot?: HTMLElement;
+  /** CAD 좌측 패널(특성 · 도면층)을 접힌 채로 연다 — 누르면 펼침(구조물 도면 미리보기). */
+  panelsCollapsed?: boolean;
 }
 
 const RECOVERY_PREFIX = "OPEN_WEB_CAD__RECOVERY__";
@@ -195,6 +197,7 @@ export function mountDrawingTemplate(
         hostTitle: "도면 양식 편집",
         hostSave: true,
         ribbonCollapsed: true,
+        panelsCollapsed: options.panelsCollapsed,
       },
     );
   };
diff --git a/M02_MasterTemplete/M02_MasterTemplete_Structure.ts b/M02_MasterTemplete/M02_MasterTemplete_Structure.ts
index a174cf9a..76f5ce8d 100644
--- a/M02_MasterTemplete/M02_MasterTemplete_Structure.ts
+++ b/M02_MasterTemplete/M02_MasterTemplete_Structure.ts
@@ -333,8 +333,7 @@ export function createStructurePanel(opts: StructurePanelOptions): StructurePane
       if (!inner?.head || inner.getElementById("m02-struct-hide")) return;
       const style = inner.createElement("style");
       style.id = "m02-struct-hide";
-      style.textContent =
-        ".cad-titlebar, .cad-ribbon, .cad-inspector { display: none !important; }";
+      style.textContent = ".cad-titlebar, .cad-ribbon { display: none !important; }";
       inner.head.append(style);
     };
     frame.addEventListener("load", apply);
@@ -377,6 +376,7 @@ export function createStructurePanel(opts: StructurePanelOptions): StructurePane
       readOnly: true,
       name: `preview:${column ?? ""}`,
       layer: "system",
+      panelsCollapsed: true, // 특성 · 도면층 패널은 접힌 채 — › 를 누르면 펼침
     });
     const frame = previewHost.querySelector("iframe");
     if (frame) hideToolbar(frame);
diff --git a/resources/tester/test_m02_structure_panel.py b/resources/tester/test_m02_structure_panel.py
index df35edd8..fac6b471 100644
--- a/resources/tester/test_m02_structure_panel.py
+++ b/resources/tester/test_m02_structure_panel.py
@@ -125,3 +125,23 @@ def test_열_머리_글_잇기():
         "SD010101 돌기슭막이 H=1.0",
         "돌기슭막이",
     ]
+
+
+def test_미리보기_CAD_패널은_숨기지_않고_접힌_채로_엶():
+    """특성 · 도면층 패널을 숨기지 않음 — 곁값 panelsCollapsed 로 접어 실음(B07 은 안 보냄)."""
+    panel = _text(PANEL)
+    assert ".cad-inspector" not in panel and "panelsCollapsed: true" in panel
+    drawing = _text(M02 / "M02_MasterTemplete_Drawing.ts")
+    assert "panelsCollapsed: options.panelsCollapsed" in drawing
+    assert "panelsCollapsed?: boolean" in _text(ROOT / "ui_template/cad_host/cad_host.ts")
+    cad = ROOT / "B07_DesignDetail/openwebcad/src"
+    bridge = _text(cad / "integration/aislo-drawing-bridge.ts")
+    assert "if (event.data.panelsCollapsed) setInspectorCollapsed(true);" in bridge
+    assert "isInspectorCollapsed()" in _text(cad / "components/Toolbar.tsx")
+
+
+def test_리본_접힘_모드에서_탭으로_편_것은_밖을_누르면_다시_접힘():
+    ribbon = _text(ROOT / "B07_DesignDetail/openwebcad/src/ribbon/Ribbon.tsx")
+    assert "if (collapsed) setPeek(true);" in ribbon  # 탭 = 잠깐 펼침(접힘 모드 유지)
+    assert "addEventListener('pointerdown', close, true)" in ribbon  # 리본 밖 = 다시 접힘
+    assert "setPeek(false);" in ribbon and "setRibbonCollapsed(!collapsed);" in ribbon  # 단추
diff --git a/ui_template/cad_host/cad_host.ts b/ui_template/cad_host/cad_host.ts
index d9c8a3c0..b9947190 100644
--- a/ui_template/cad_host/cad_host.ts
+++ b/ui_template/cad_host/cad_host.ts
@@ -65,6 +65,8 @@ export interface CadLoadExtra {
   hostSave?: boolean;
   /** 리본을 접힌 채로 연다 — 안 보내면 펼침 그대로. */
   ribbonCollapsed?: boolean;
+  /** 좌측 패널(특성 · 도면층)을 접힌 채로 연다 — 안 보내면(B07) 지금 상태 그대로. */
+  panelsCollapsed?: boolean;
 }
 
 export interface CadHost<D extends CadHostDrawing, M, Q> {