diff --git a/app/src/main/java/com/example/medilightv2android/ui/views/monitoring/PlacementGuideView.kt b/app/src/main/java/com/example/medilightv2android/ui/views/monitoring/PlacementGuideView.kt
index 8aed70f..94f34a1 100644
--- a/app/src/main/java/com/example/medilightv2android/ui/views/monitoring/PlacementGuideView.kt
+++ b/app/src/main/java/com/example/medilightv2android/ui/views/monitoring/PlacementGuideView.kt
@@ -221,10 +221,12 @@ fun PlacementGuideView(appState: AppState) {
                 .padding(horizontal = 24.dp),
             horizontalAlignment = Alignment.CenterHorizontally
         ) {
-            // ─── (1) Hint 1 — 시작 전 안내 (항상 표시, 레이아웃 안정) ───
+            // ─── (1) Hint 1 — 시작 전 안내 (칸은 상시 유지, 텍스트는 Start 누르면 사라짐) ───
             val hint1Bg = Color(0xFFFFF3E0)
             Text(
-                text = "Place VesiScan above the pubic bone, then press Start",
+                text = if (waitingForStart)
+                    "Place VesiScan above the pubic bone, then press Start"
+                    else " ",   // 공백 — 칸 높이 유지
                 fontSize = 26.sp,                  // 태블릿: 더 크게
                 fontWeight = FontWeight.Bold,
                 color = Color.Black,