diff --git a/cypher-executor/src/routes/console.ts b/cypher-executor/src/routes/console.ts
index a3a62b8..88caff6 100644
--- a/cypher-executor/src/routes/console.ts
+++ b/cypher-executor/src/routes/console.ts
@@ -488,7 +488,7 @@ function renderConsoleHtml(registryBase: string): string {
     tenant: '',
     total: null,           // KBDB 總筆數（誠實 total）
     chip: '',              // entry_type filter（'' = 全部）
-    semantic: false,
+    semantic: true,        // 大眾化 default：語意為主（leo 2026-07-05，會打字就查得到，含 normalize）
     cardId: '',
     graphCenter: '',
     wfCache: null,
@@ -755,6 +755,7 @@ function renderConsoleHtml(registryBase: string): string {
   function initSearchOnce() {
     if (searchInited) { return; }
     searchInited = true;
+    $('se-sem').classList.toggle('on', S.semantic); // 開關反映預設（語意 default on）
     renderChips();
     ensureTotal();
   }
diff --git a/cypher-executor/src/routes/kbdb-proxy.ts b/cypher-executor/src/routes/kbdb-proxy.ts
index 8d12267..d6e2c6f 100644
--- a/cypher-executor/src/routes/kbdb-proxy.ts
+++ b/cypher-executor/src/routes/kbdb-proxy.ts
@@ -129,7 +129,11 @@ kbdbProxyRouter.get('/kbdb/search', async (c) => {
   const q = c.req.query('q');
   if (!q) return c.json({ error: 'q 必填' }, 400);
   const { base, headers } = kbdbBase(c.env);
-  const params = new URLSearchParams({ q, owner_id: owner });
+  const mode = c.req.query('mode');
+  // self-hosted 單租戶：mode=semantic 暫不注入 owner_id（Vectorize 未建 owner_id metadata index，
+  // 且 embedded 向量非 owner=tenant → 帶 owner 一律回 0）。單租戶下全庫語意查即正確。
+  // <TBD-PhaseB>：多租戶時語意也要 owner 隔離（建 Vectorize owner_id metadata index + 向量帶 owner）。
+  const params = new URLSearchParams(mode === 'semantic' ? { q } : { q, owner_id: owner });
   for (const k of ['entry_type', 'source', 'mode']) {
     const v = c.req.query(k);
     if (v) params.set(k, v);