diff --git a/src/trx-client/trx-frontend/trx-frontend-http/assets/web/app.js b/src/trx-client/trx-frontend/trx-frontend-http/assets/web/app.js
index 3c9d2c8..5949b84 100644
--- a/src/trx-client/trx-frontend/trx-frontend-http/assets/web/app.js
+++ b/src/trx-client/trx-frontend/trx-frontend-http/assets/web/app.js
@@ -4854,14 +4854,63 @@ function bmCategoryColorMap() {
   return map;
 }
 
+function createBookmarkChip(bm, colorMap) {
+  const span = document.createElement("span");
+  const freqStr = typeof bmFmtFreq === "function"
+    ? bmFmtFreq(bm.freq_hz) : bm.freq_hz + "\u202fHz";
+  const esc = (s) => String(s)
+    .replace(/&/g, "&amp;").replace(/</g, "&lt;").replace(/>/g, "&gt;");
+  span.className = "spectrum-bookmark-chip";
+  span.title = bm.name + " \u2014 " + freqStr + (bm.comment ? "\n" + bm.comment : "");
+  span.dataset.bmId = bm.id;
+  span.innerHTML =
+    "<svg class='bm-icon-svg' viewBox='0 0 8 12' width='8' height='12' aria-hidden='true'>" +
+    "<path d='M0,0 h8 v10 l-4,2 l-4,-2 Z'/>" +
+    "</svg>\u00a0" + esc(bm.name);
+  const col = colorMap[bm.category || ""];
+  span.style.setProperty("--bm-cat-bg", col);
+  span.style.setProperty("--bm-cat-fg", bmContrastFg(col));
+  span.addEventListener("click", () => {
+    if (typeof bmApply === "function") bmApply(bm);
+  });
+  return span;
+}
+
+function updateSideBookmarkStack(container, bookmarks, colorMap) {
+  if (!container) return;
+  container.innerHTML = "";
+  if (!Array.isArray(bookmarks) || bookmarks.length === 0) {
+    container.classList.remove("bm-side-visible");
+    return;
+  }
+
+  container.classList.add("bm-side-visible");
+  for (const bm of bookmarks) {
+    container.appendChild(createBookmarkChip(bm, colorMap));
+  }
+}
+
 function updateBookmarkAxis(range) {
   const axisEl = document.getElementById("spectrum-bookmark-axis");
+  const leftSideEl = document.getElementById("spectrum-bookmark-side-left");
+  const rightSideEl = document.getElementById("spectrum-bookmark-side-right");
   if (!axisEl) return;
 
   const _bmRef = typeof bmList !== "undefined" ? bmList : null;
-  const visBookmarks = Array.isArray(_bmRef)
-    ? _bmRef.filter((bm) => bm.freq_hz >= range.visLoHz && bm.freq_hz <= range.visHiHz)
-    : [];
+  const allBookmarks = Array.isArray(_bmRef) ? _bmRef : [];
+  const visBookmarks = allBookmarks.filter((bm) => bm.freq_hz >= range.visLoHz && bm.freq_hz <= range.visHiHz);
+  const leftBookmarks = allBookmarks
+    .filter((bm) => bm.freq_hz < range.visLoHz)
+    .sort((a, b) => b.freq_hz - a.freq_hz)
+    .slice(0, 3);
+  const rightBookmarks = allBookmarks
+    .filter((bm) => bm.freq_hz > range.visHiHz)
+    .sort((a, b) => a.freq_hz - b.freq_hz)
+    .slice(0, 3);
+  const colorMap = bmCategoryColorMap();
+
+  updateSideBookmarkStack(leftSideEl, leftBookmarks, colorMap);
+  updateSideBookmarkStack(rightSideEl, rightBookmarks, colorMap);
 
   const hasVisible = visBookmarks.length > 0;
   axisEl.classList.toggle("bm-axis-visible", hasVisible);
@@ -4877,26 +4926,8 @@ function updateBookmarkAxis(range) {
   if (axisEl.dataset.bmKey !== newKey) {
     axisEl.dataset.bmKey = newKey;
     axisEl.innerHTML = "";
-    const colorMap = bmCategoryColorMap();
-    const esc = (s) => String(s)
-      .replace(/&/g, "&amp;").replace(/</g, "&lt;").replace(/>/g, "&gt;");
     for (const bm of visBookmarks) {
-      const span = document.createElement("span");
-      const freqStr = typeof bmFmtFreq === "function"
-        ? bmFmtFreq(bm.freq_hz) : bm.freq_hz + "\u202fHz";
-      span.title = bm.name + " \u2014 " + freqStr + (bm.comment ? "\n" + bm.comment : "");
-      span.dataset.bmId = bm.id;
-      span.innerHTML =
-        "<svg class='bm-icon-svg' viewBox='0 0 8 12' width='8' height='12' aria-hidden='true'>" +
-        "<path d='M0,0 h8 v10 l-4,2 l-4,-2 Z'/>" +
-        "</svg>\u00a0" + esc(bm.name);
-      const col = colorMap[bm.category || ""];
-      span.style.setProperty("--bm-cat-bg", col);
-      span.style.setProperty("--bm-cat-fg", bmContrastFg(col));
-      span.addEventListener("click", () => {
-        if (typeof bmApply === "function") bmApply(bm);
-      });
-      axisEl.appendChild(span);
+      axisEl.appendChild(createBookmarkChip(bm, colorMap));
     }
   }
 
diff --git a/src/trx-client/trx-frontend/trx-frontend-http/assets/web/index.html b/src/trx-client/trx-frontend/trx-frontend-http/assets/web/index.html
index 9b5175f..56a924e 100644
--- a/src/trx-client/trx-frontend/trx-frontend-http/assets/web/index.html
+++ b/src/trx-client/trx-frontend/trx-frontend-http/assets/web/index.html
@@ -81,9 +81,11 @@
       <div id="spectrum-bookmark-axis"></div>
       <div id="spectrum-panel" style="display:none;">
         <div class="spectrum-wrap">
+          <div id="spectrum-bookmark-side-left" class="spectrum-bookmark-side spectrum-bookmark-side-left" aria-hidden="true"></div>
           <button id="spectrum-center-left-btn" class="spectrum-edge-shift spectrum-edge-shift-left" type="button" aria-label="Shift spectrum center left">&lsaquo;</button>
           <canvas id="spectrum-canvas"></canvas>
           <button id="spectrum-center-right-btn" class="spectrum-edge-shift spectrum-edge-shift-right" type="button" aria-label="Shift spectrum center right">&rsaquo;</button>
+          <div id="spectrum-bookmark-side-right" class="spectrum-bookmark-side spectrum-bookmark-side-right" aria-hidden="true"></div>
           <div id="spectrum-tooltip"></div>
           <div id="spectrum-freq-axis"></div>
         </div>
diff --git a/src/trx-client/trx-frontend/trx-frontend-http/assets/web/style.css b/src/trx-client/trx-frontend/trx-frontend-http/assets/web/style.css
index eb35cc5..560d44e 100644
--- a/src/trx-client/trx-frontend/trx-frontend-http/assets/web/style.css
+++ b/src/trx-client/trx-frontend/trx-frontend-http/assets/web/style.css
@@ -525,8 +525,10 @@ small { color: var(--text-muted); }
   position: relative;
   display: flex;
   flex-direction: column;
+  flex: 1 1 auto;
+  min-height: 0;
   gap: 0;
-  margin-bottom: 0.9rem;
+  margin-bottom: 0;
 }
 #signal-overlay-canvas {
   position: absolute;
@@ -912,7 +914,12 @@ small { color: var(--text-muted); }
 .meter-bar { flex: 1 1 auto; height: 12px; border-radius: 999px; background: var(--btn-bg); border: 1px solid var(--border-light); overflow: hidden; }
 .meter-fill { height: 100%; width: 0%; background: linear-gradient(90deg, var(--accent-green), var(--accent-yellow), var(--accent-red)); transition: width 150ms ease; }
 .meter-value { font-size: 0.95rem; color: var(--text-heading); min-width: 64px; text-align: right; }
-#content { display: flex; flex-direction: column; gap: 1.1rem; min-height: 0; overflow: visible; }
+#tab-main {
+  display: flex;
+  flex-direction: column;
+  min-height: 0;
+}
+#content { display: flex; flex: 1 1 auto; flex-direction: column; gap: 1.1rem; min-height: 0; overflow: visible; }
 .tab-panel { flex: 1 1 auto; min-height: 0; overflow: visible; }
 .tab-bar {
   display: flex;
@@ -1394,6 +1401,20 @@ button:focus-visible, input:focus-visible, select:focus-visible {
     width: 1.5rem;
     height: 2.35rem;
   }
+  .spectrum-bookmark-side {
+    width: 5.85rem;
+    gap: 0.22rem;
+  }
+  .spectrum-bookmark-side-left {
+    left: -7.85rem;
+  }
+  .spectrum-bookmark-side-right {
+    right: -7.85rem;
+  }
+  .spectrum-bookmark-side .spectrum-bookmark-chip {
+    font-size: 0.58rem;
+    padding: 2px 6px;
+  }
   .spectrum-edge-shift-left {
     left: -1.8rem;
   }
@@ -1493,16 +1514,26 @@ button:focus-visible, input:focus-visible, select:focus-visible {
 /* ── Spectrum display ─────────────────────────────────────────────────── */
 #spectrum-panel {
   margin-bottom: 0;
+  flex: 1 1 auto;
+  min-height: 0;
+  display: flex;
+  flex-direction: column;
 }
 .spectrum-wrap {
   position: relative;
+  display: flex;
+  flex: 1 1 auto;
+  flex-direction: column;
+  min-height: 0;
   width: 100%;
   user-select: none;
 }
 #spectrum-canvas {
   display: block;
   width: 100%;
-  height: var(--spectrum-plot-height);
+  flex: 1 1 auto;
+  min-height: var(--spectrum-plot-height);
+  height: auto;
   background: var(--spectrum-bg);
   border-radius: 6px 6px 0 0;
   cursor: crosshair;
@@ -1510,7 +1541,7 @@ button:focus-visible, input:focus-visible, select:focus-visible {
 }
 .spectrum-edge-shift {
   position: absolute;
-  top: calc(var(--spectrum-plot-height) / 2);
+  top: calc((100% - 18px) / 2);
   transform: translateY(-50%);
   z-index: 8;
   width: 1.7rem;
@@ -1589,7 +1620,7 @@ button:focus-visible, input:focus-visible, select:focus-visible {
 #spectrum-bookmark-axis.bm-axis-visible {
   height: 26px;
 }
-#spectrum-bookmark-axis span {
+.spectrum-bookmark-chip {
   position: absolute;
   transform: translate(-50%, -50%);
   top: 50%;
@@ -1610,9 +1641,37 @@ button:focus-visible, input:focus-visible, select:focus-visible {
   align-items: center;
   gap: 4px;
 }
-#spectrum-bookmark-axis span:hover {
+.spectrum-bookmark-chip:hover {
   filter: brightness(1.15);
 }
+.spectrum-bookmark-side {
+  position: absolute;
+  top: calc((100% - 18px) / 2);
+  transform: translateY(-50%);
+  z-index: 7;
+  width: 7.25rem;
+  display: none;
+  flex-direction: column;
+  gap: 0.28rem;
+}
+.spectrum-bookmark-side.bm-side-visible {
+  display: flex;
+}
+.spectrum-bookmark-side-left {
+  left: -10.15rem;
+  align-items: flex-end;
+}
+.spectrum-bookmark-side-right {
+  right: -10.15rem;
+  align-items: flex-start;
+}
+.spectrum-bookmark-side .spectrum-bookmark-chip {
+  position: relative;
+  top: auto;
+  left: auto;
+  transform: none;
+  max-width: 100%;
+}
 .bm-icon-svg path {
   fill: var(--bm-cat-fg, #1a202c);
 }