diff --git a/main.js b/main.js
index 0143334a..c643493b 100644
--- a/main.js
+++ b/main.js
@@ -8337,7 +8337,20 @@ function openSettingsTab(section) {
   }
   createTab(null, { settings: true, settingsSection: slug });
 }
-ipcMain.handle("open-settings", (_e, section) => openSettingsTab(section));
+// The toolbar's Theseus logo toggles the Settings tab: if Settings is already
+// the active tab, clicking the logo closes it (switching to the previously
+// active tab, or the first remaining one). Called without a section, so a
+// deep-link call like openSettingsTab("ai-engines") always opens rather than
+// toggling — the toggle is intent-of-the-logo-click, not of a nav route.
+function toggleSettingsTab() {
+  const ex = tabs.find((t) => t.settings);
+  if (ex && isActiveId(ex.id)) { closeTab(ex.id); return; }
+  openSettingsTab();
+}
+ipcMain.handle("open-settings", (_e, section) => {
+  if (section) openSettingsTab(section);
+  else toggleSettingsTab();
+});
 // Settings › Performance drives Shield and Cookie Pop-ups through their
 // add-ons' own message handlers; only the Settings tab may call this.
 const isSettingsSender = (e) => tabs.some((t) => t.settings && t.view?.webContents === e.sender);
diff --git a/settings.html b/settings.html
index 922b87fd..2ab46683 100644
--- a/settings.html
+++ b/settings.html
@@ -320,7 +320,6 @@
     <a data-sec="performance">Performance</a>
     <a data-sec="privacy">Privacy</a>
     <a data-sec="plugins">System</a>
-    <a data-sec="ariadne">Ariadne's Thread</a>
     <a data-sec="aegis">Aegis</a>
     <a data-sec="addons">Extensions</a>
     <a data-sec="sidebar">Sidebar</a>
@@ -632,11 +631,11 @@
       </div>
     </section>
 
-    <!-- Top-level landing section for Ariadne's Thread. Chevrons into the
-         existing sub-page under Plug-ins, where install / policy / sources /
-         status / uninstall live. The sub-page keeps its "Plug-ins ›" crumb
-         so Ariadne stays reachable from either entry. -->
+    <!-- Ariadne's Thread landing — no longer a top-level nav entry. The
+         System section's chevron row navigates here; the plugins-ariadne
+         sub-page's own crumb then goes back to System. -->
     <section id="ariadne" hidden>
+      <div class="crumb"><a data-go="plugins">System</a> ›</div>
       <h1>Ariadne's Thread</h1>
       <p class="lede">A local daemon that resolves BCDN names for <b>every browser on this machine</b>, not just Theseus. Theseus has its own built-in resolver either way; this plug-in is for Chrome, Edge, Firefox and the rest.</p>
       <div class="row link" data-go="plugins/ariadne">