diff --git a/B06_Section/B06_Section_UI_Cross_Design.ts b/B06_Section/B06_Section_UI_Cross_Design.ts
index 723b97f95..5020be6bb 100644
--- a/B06_Section/B06_Section_UI_Cross_Design.ts
+++ b/B06_Section/B06_Section_UI_Cross_Design.ts
@@ -385,7 +385,7 @@ export function buildDesignControls(
   const groundSegment = groundToggle.wrap;
   groundSegment.classList.add("b06-design__seg--header");
   // 단면 유형은 지형에서 자동 판정되며(D-2), 제목행 pill로 표시한다(E-3, Cross_View에서 생성).
-  // 아래 옵션은 상시 노출하되 선행 조건 미충족 시 비활성 처리한다(E-6).
+  // 아래 옵션은 선행 조건 미충족 시 비활성 = 숨김(179-2 · CSS) — 편측의 쪽은 알약 글에.
   const rockCut = isRock(state.ground) && state.mode !== "both_fill";
   const hasDitch = state.mode !== "both_fill";
   // 측구 생성 여부(자동 판정 or 사용자 override) — 측구형식은 측구가 있을 때만 의미 있다.
@@ -417,9 +417,9 @@ export function buildDesignControls(
     !hasDitch,
     L("B06_Design_Disabled_NoDitch"),
   );
-  // 측구형식(일반/L형): 암 지반 + 절토 단면 + 측구가 실제 있을 때만 활성.
+  // 측구형식(일반/L형): 암 지반 + 절토 단면 + 측구가 실제 있을 때만 활성 · 이름 글 없이 툴팁(179-2).
   const ditchTypeSeg = segment(
-    L("B06_Design_DitchType_Legend"),
+    "",
     DITCH_TYPE_OPTIONS,
     state.ditchType,
     (value) => {
@@ -429,6 +429,7 @@ export function buildDesignControls(
     !rockCut || !ditchOn,
     !ditchOn ? L("B06_Design_Disabled_NoDitchType") : L("B06_Design_Disabled_RockCut"),
   );
+  ditchTypeSeg.title = L("B06_Design_DitchType_Legend");
   // 2단계 경사 토글: 암 지반 + 절토 단면에서만 활성. 활성="복합경사"/비활성="단경사"(E-7).
   const twoStage = toggle(
     "",
@@ -486,7 +487,8 @@ export function buildDesignControls(
       let overflow = bar.scrollWidth - clientWidth;
       let moveCount = 0;
       while (overflow > 1 && moveCount < moveable.length) {
-        overflow -= widths[moveable.length - 1 - moveCount] + barGapPx;
+        const width = widths[moveable.length - 1 - moveCount]; // 숨긴 칸(179-2)은 폭 · 간격 0
+        overflow -= width ? width + barGapPx : 0;
         moveCount += 1;
       }
       return moveCount;
diff --git a/B06_Section/B06_Section_UI_Style_Cross.css b/B06_Section/B06_Section_UI_Style_Cross.css
index 2694593da..0effa7db6 100644
--- a/B06_Section/B06_Section_UI_Style_Cross.css
+++ b/B06_Section/B06_Section_UI_Style_Cross.css
@@ -532,13 +532,9 @@
   white-space: nowrap;
 }
 
-/* 선행 조건 미충족 옵션(E-6) — 상시 노출하되 흐리게·클릭 불가. */
+/* 선행 조건 미충족 옵션 — 숨김(179-2 · 옛 E-6 「흐리게 늘 보임」 폐기 · 쪽은 단면유형 알약에). */
 .b06-design__seg--disabled {
-  opacity: 0.4;
-}
-
-.b06-design__seg--disabled .b06-design__btn {
-  cursor: not-allowed;
+  display: none;
 }
 
 .b06-design__seg-buttons {
diff --git a/resources/tester/test_179_2_ditch_row_compact.py b/resources/tester/test_179_2_ditch_row_compact.py
new file mode 100644
index 000000000..c1c0866ba
--- /dev/null
+++ b/resources/tester/test_179_2_ditch_row_compact.py
@@ -0,0 +1,36 @@
+# -*- coding: utf-8 -*-
+"""PLAN 179-2 — 측구 줄 컴팩트(W16 (가)): 막힌 단추 숨김 · 「측구형식」 글 지움(툴팁) · 알약에 편측 쪽(소스 시험)."""
+
+import os
+import re
+
+ROOT = os.path.dirname(os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
+
+
+def _src(rel: str) -> str:
+    return open(os.path.join(ROOT, rel), encoding="utf-8").read()
+
+
+def test_막힌_묶음은_숨김():
+    css = _src("B06_Section/B06_Section_UI_Style_Cross.css")
+    body = re.search(r"\.b06-design__seg--disabled\s*\{([^}]*)\}", css).group(1)
+    assert "display: none;" in body
+    assert "opacity" not in body
+
+
+def test_측구형식_글_없이_툴팁():
+    cd = _src("B06_Section/B06_Section_UI_Cross_Design.ts")
+    seg = cd.split("const ditchTypeSeg = segment(", 1)[1].split(");", 1)[0]
+    assert seg.lstrip().startswith('"",')
+    assert 'ditchTypeSeg.title = L("B06_Design_DitchType_Legend");' in cd
+
+
+def test_넘침_셈은_숨긴_칸_폭_간격_뺌():
+    cd = _src("B06_Section/B06_Section_UI_Cross_Design.ts")
+    assert "overflow -= width ? width + barGapPx : 0;" in cd
+
+
+def test_알약에_편측_쪽():
+    lb = _src("ui_template/ui_template_locale_b2.ts")
+    assert 'B06_Design_Mode_LeftCut: ["편측 성토(좌 절토)"' in lb
+    assert 'B06_Design_Mode_RightCut: ["편측 성토(우 절토)"' in lb
diff --git a/ui_template/ui_template_locale_b2.ts b/ui_template/ui_template_locale_b2.ts
index e84c27cf3..a97c57165 100644
--- a/ui_template/ui_template_locale_b2.ts
+++ b/ui_template/ui_template_locale_b2.ts
@@ -420,8 +420,8 @@ export const ui_locales_b2 = {
   B06_Design_Ground_Ripping: ["리핑암", "Ripping rock"],
   B06_Design_Ground_Blasting: ["발파암", "Blasting rock"],
   B06_Design_Mode_Legend: ["단면유형", "Section type"],
-  B06_Design_Mode_LeftCut: ["편측 성토", "One-side fill"],
-  B06_Design_Mode_RightCut: ["편측 성토", "One-side fill"],
+  B06_Design_Mode_LeftCut: ["편측 성토(좌 절토)", "One-side fill (left cut)"],
+  B06_Design_Mode_RightCut: ["편측 성토(우 절토)", "One-side fill (right cut)"],
   B06_Design_Mode_BothCut: ["양측 절토", "Both cut"],
   B06_Design_Mode_BothFill: ["양측 성토", "Both fill"],
   B06_Design_Ditch_Legend: ["측구위치", "Ditch side"],