diff --git a/B07_DesignDetail/openwebcad/src/components/ui-state.ts b/B07_DesignDetail/openwebcad/src/components/ui-state.ts
index 868f1375e..faf282bf6 100644
--- a/B07_DesignDetail/openwebcad/src/components/ui-state.ts
+++ b/B07_DesignDetail/openwebcad/src/components/ui-state.ts
@@ -8,7 +8,8 @@ import { notifyWindow } from '../state';
 export type InspectorTab = 'properties' | 'layers';
 
 let inspectorTab: InspectorTab = 'layers';
-let inspectorCollapsed = false;
+/** 특성·도면층 패널은 닫힌 채 시작 — 펼치기 단추로 연다. */
+let inspectorCollapsed = true;
 let quickPropertiesVisible = false;
 let activeRibbonTab = 'home';
 let blockLibraryVisible = false;