diff --git a/frontend/js/labs/stereo.js b/frontend/js/labs/stereo.js
index d3fd2f1..01a3e2e 100644
--- a/frontend/js/labs/stereo.js
+++ b/frontend/js/labs/stereo.js
@@ -289,6 +289,7 @@ class StereoSim {
     this._customPoints = [];      // [{pos: Vector3, edgeIdx: number, t: number, label: string}]
     this._connections  = [];      // [{from: idx, to: idx}]
     this._connectPicks = [];      // temp picks for connecting
+    this.showConnectionLengths = true; // show length labels on connected segments
     this._pointGroup   = new THREE.Group();
     this.scene.add(this._pointGroup);
     this._nextPointId  = 1;
@@ -557,6 +558,12 @@ class StereoSim {
     this.renderer.domElement.style.cursor = on ? 'pointer' : 'grab';
   }
 
+  toggleConnectionLengths(on) {
+    this.showConnectionLengths = on;
+    this._rebuildPointVisuals();
+    this._invalidate();
+  }
+
   clearCustomPoints() {
     this._customPoints = [];
     this._connections = [];
@@ -2794,13 +2801,15 @@ class StereoSim {
       line.computeLineDistances();
       this._pointGroup.add(line);
 
-      // Distance label
-      const dist = posA.distanceTo(posB);
-      const mid = new THREE.Vector3().addVectors(posA, posB).multiplyScalar(0.5);
-      const lbl = this._makeTextSprite(dist.toFixed(2), '#F59E0B', 36);
-      lbl.position.copy(mid).add(new THREE.Vector3(0, 0.25, 0));
-      lbl.scale.set(0.8, 0.4, 1);
-      this._pointGroup.add(lbl);
+      // Distance label (optional — toggle "Длины отрезков")
+      if (this.showConnectionLengths) {
+        const dist = posA.distanceTo(posB);
+        const mid = new THREE.Vector3().addVectors(posA, posB).multiplyScalar(0.5);
+        const lbl = this._makeTextSprite(dist.toFixed(2), '#F59E0B', 36);
+        lbl.position.copy(mid).add(new THREE.Vector3(0, 0.25, 0));
+        lbl.scale.set(0.8, 0.4, 1);
+        this._pointGroup.add(lbl);
+      }
     }
   }
 
@@ -5059,6 +5068,12 @@ class StereoSim {
     _stereoUpdatePointsInfo();
   }
 
+  function stereoToggleConnLen(toggle) {
+    const on = !toggle.classList.contains('on');
+    toggle.classList.toggle('on', on);
+    if (stereoSim) stereoSim.toggleConnectionLengths(on);
+  }
+
   /* ── Constructions: lines & planes (Phase A) ── */
   function stereoLineMode(btn) {
     const on = !btn.classList.contains('active');
diff --git a/frontend/labs-bodies.html b/frontend/labs-bodies.html
index 530044e..2597d52 100644
--- a/frontend/labs-bodies.html
+++ b/frontend/labs-bodies.html
@@ -3670,6 +3670,10 @@
             <button class="st-action-btn" onclick="stereoMeasureUndo()">Удалить изм.</button>
             <button class="st-action-btn" onclick="stereoMeasureClear()">Очист. изм.</button>
           </div>
+          <div onclick="stereoToggleConnLen(this.querySelector('.st-toggle'))" class="st-toggle-row" title="Показывать длины соединённых отрезков">
+            <span class="st-toggle-label"><svg viewBox="0 0 24 24"><line x1="4" y1="12" x2="20" y2="12" stroke-dasharray="4,2"/><line x1="4" y1="9" x2="4" y2="15"/><line x1="20" y1="9" x2="20" y2="15"/></svg>Длины отрезков</span>
+            <div class="st-toggle on" id="stg-connlen"></div>
+          </div>
           <div id="points-info" style="font-size:0.65rem;color:rgba(255,255,255,0.4);margin-top:2px"></div>
 
           <!-- ── Построения (прямые / плоскости) ── -->