diff --git a/public/style.css b/public/style.css
index ea1f02304..0b6067fb4 100644
--- a/public/style.css
+++ b/public/style.css
@@ -4987,7 +4987,8 @@ body[data-cb-preset="achromat"] {
 .fux-ctx-item { display: block; width: 100%; text-align: left; background: transparent; border: none; color: var(--text); padding: 5px 12px; font-size: 12px; cursor: pointer; font-family: var(--mono); }
 .fux-ctx-item:hover { background: var(--bg-hover, rgba(120,160,255,0.12)); }
 
-.fux-saved-menu { position: absolute; top: 100%; left: 0; min-width: 320px; background: var(--surface); border: 1px solid var(--border); border-radius: 6px; z-index: var(--z-dropdown); box-shadow: 0 4px 14px rgba(0,0,0,0.3); margin-top: 4px; padding: 4px 0; }
+/* #72: the Saved trigger sits at the right end of the filter row — anchor right and bound the width so long expressions ellipsize instead of widening #pktLeft. */
+.fux-saved-menu { position: absolute; top: 100%; right: 0; width: max-content; min-width: 320px; max-width: min(480px, calc(100vw - 32px)); background: var(--surface); border: 1px solid var(--border); border-radius: 6px; z-index: var(--z-dropdown); box-shadow: 0 4px 14px rgba(0,0,0,0.3); margin-top: 4px; padding: 4px 0; }
 .fux-saved-menu.hidden { display: none; }
 .fux-saved-header { padding: 6px 10px; font-size: 11px; font-weight: 600; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.05em; border-bottom: 1px solid var(--border); }
 .fux-saved-item { display: flex; align-items: center; gap: 8px; padding: 5px 10px; cursor: pointer; font-size: 12px; }
diff --git a/test-filter-ux-e2e.js b/test-filter-ux-e2e.js
index dc008667a..b256dc8d8 100644
--- a/test-filter-ux-e2e.js
+++ b/test-filter-ux-e2e.js
@@ -173,6 +173,44 @@ function assert(c, m) { if (!c) throw new Error(m || 'assertion failed'); }
     await page.evaluate(() => localStorage.removeItem('corescope_saved_filters_v1'));
   });
 
+  // #72: the Saved trigger sits at the right end of the filter row; a
+  // left-anchored, unbounded menu ran past the viewport and made #pktLeft
+  // scroll horizontally. Below 601px the filter expression row is hidden.
+  for (const width of [1400, 1024, 768]) {
+    await step(`Saved-filter menu stays inside the viewport at ${width}px (#72)`, async () => {
+      await page.setViewportSize({ width, height: 900 });
+      await page.evaluate(() => localStorage.setItem('corescope_saved_filters_v1', JSON.stringify([{
+        name: 'E2E long filter',
+        expr: 'type == ADVERT && payload.flags.repeater == true && snr > 5 && hops > 1 && payload.name contains "a very long repeater name"',
+        ts: 0,
+      }])));
+      await page.evaluate(() => document.getElementById('filterSavedMenu').classList.add('hidden'));
+      await page.click('#filterSavedTrigger');
+      await page.waitForSelector('#filterSavedMenu:not(.hidden)');
+      const r = await page.evaluate(() => {
+        const menu = document.getElementById('filterSavedMenu');
+        const mr = menu.getBoundingClientRect();
+        const left = document.getElementById('pktLeft');
+        const exprs = Array.from(menu.querySelectorAll('.fux-saved-expr'));
+        const long = exprs[exprs.length - 1];
+        return {
+          left: mr.left, right: mr.right, vw: document.documentElement.clientWidth,
+          paneOverflow: left.scrollWidth - left.clientWidth,
+          longTruncated: long.scrollWidth > long.clientWidth,
+          longText: long.textContent,
+        };
+      });
+      await page.evaluate(() => {
+        document.getElementById('filterSavedMenu').classList.add('hidden');
+        localStorage.removeItem('corescope_saved_filters_v1');
+      });
+      assert(r.left >= 0 && r.right <= r.vw, 'menu outside viewport: ' + JSON.stringify(r));
+      assert(r.paneOverflow <= 1, '#pktLeft scrolls horizontally: ' + JSON.stringify(r));
+      assert(/a very long repeater name/.test(r.longText), 'long filter not rendered: ' + JSON.stringify(r));
+      assert(r.longTruncated, 'long expression not ellipsized (menu width unbounded): ' + JSON.stringify(r));
+    });
+  }
+
   await browser.close();
 
   console.log(`\n=== Results: passed ${passed} failed ${failed} ===`);