diff --git a/components/global-search/__tests__/search-tab-body.test.tsx b/components/global-search/__tests__/search-tab-body.test.tsx
index 68807fe40..fea01fdcf 100644
--- a/components/global-search/__tests__/search-tab-body.test.tsx
+++ b/components/global-search/__tests__/search-tab-body.test.tsx
@@ -60,6 +60,8 @@ vi.mock('@/components/pro/pro-email-tab-body', () => ({
 }));
 
 import { SearchTabBody } from '../search-tab-body';
+import { openHit } from '@/lib/global-search/open-hit';
+import { PaneSizeContext } from '@/hooks/use-pane-size';
 
 /** Renders the tab the way the Pro page does: data flows from the tab store. */
 function Harness({ tabId }: { tabId: string }) {
@@ -123,3 +125,29 @@ describe('SearchTabBody scope switching', () => {
     }
   });
 });
+
+describe('SearchTabBody in a narrow pane', () => {
+  beforeEach(() => {
+    resetTabs();
+    vi.mocked(openHit).mockClear();
+  });
+
+  const renderInPane = async (width: number) => {
+    const tabId = useProTabStore.getState().openSearchTab({ query: 'Ann', scope: 'all', accountId: null, title: 'Ann' });
+    render(<PaneSizeContext.Provider value={width}><Harness tabId={tabId} /></PaneSizeContext.Provider>);
+    await waitFor(() => expect(rowCount('mail')).toBe(1), { timeout: 5000 });
+    return document.querySelector<HTMLElement>('[data-hit-kind="mail"]')!;
+  };
+
+  it('opens a hit on click where no preview fits', async () => {
+    const row = await renderInPane(500);
+    fireEvent.click(row);
+    expect(openHit).toHaveBeenCalledTimes(1);
+  });
+
+  it('only selects it where the preview shows', async () => {
+    const row = await renderInPane(1100);
+    fireEvent.click(row);
+    expect(openHit).not.toHaveBeenCalled();
+  });
+});
diff --git a/components/global-search/search-tab-body.tsx b/components/global-search/search-tab-body.tsx
index c6cc36ea2..e3ad4601c 100644
--- a/components/global-search/search-tab-body.tsx
+++ b/components/global-search/search-tab-body.tsx
@@ -4,6 +4,7 @@ import { useEffect, useMemo, useState } from "react";
 import { Loader2, Search } from "@/components/icons";
 import { useTranslations } from "next-intl";
 import { useGlobalSearch } from "@/hooks/use-global-search";
+import { usePaneSize } from "@/hooks/use-pane-size";
 import { openHit } from "@/lib/global-search/open-hit";
 import type { SearchScope } from "@/lib/global-search/query-parser";
 import { hitKey, SEARCH_KINDS, type GlobalSearchHit, type SearchKind } from "@/lib/global-search/types";
@@ -13,9 +14,14 @@ import { useSearchHistoryStore } from "@/stores/search-history-store";
 import { SearchFacets } from "@/components/global-search/search-facets";
 import { SearchPreview } from "@/components/global-search/search-preview";
 import { SearchResultList } from "@/components/global-search/search-result-list";
+import { cn } from "@/lib/utils";
 
 export const SEARCH_TAB_REMOTE_LIMIT = 100;
 export const SEARCH_TAB_LOCAL_LIMIT = 50;
+/** Facets, a 384 px list and a preview need a pane this wide (Tailwind's lg). */
+const PREVIEW_MIN_PANE = 1024;
+/** Below this (a split pane) the facets narrow so the list keeps room for its rows. */
+const WIDE_FACETS_MIN_PANE = 768;
 
 export interface SearchTabBodyProps {
   tabId: string;
@@ -89,9 +95,15 @@ export function SearchTabBody({ tabId, data }: SearchTabBodyProps) {
   const setAccountId = (accountId: string | null) => updateSearchTab(tabId, { accountId });
   const handleOpen = (hit: GlobalSearchHit) => { void openHit(hit, { proShell: true }); };
 
+  // The tab lives in a pane, which a split can make far narrower than the
+  // window, so the pane's width decides and not a viewport breakpoint.
+  const paneWidth = usePaneSize();
+  const showPreview = paneWidth === null || paneWidth >= PREVIEW_MIN_PANE;
+  const wideFacets = paneWidth === null || paneWidth >= WIDE_FACETS_MIN_PANE;
+
   return (
     <div className="flex h-full min-h-0 w-full bg-background">
-      <aside className="w-56 shrink-0 bg-secondary border-e border-border overflow-y-auto">
+      <aside className={cn("shrink-0 bg-secondary border-e border-border overflow-y-auto", wideFacets ? "w-56" : "w-40")}>
         <SearchFacets
           scope={data.scope}
           onScopeChange={setScope}
@@ -105,7 +117,7 @@ export function SearchTabBody({ tabId, data }: SearchTabBodyProps) {
         />
       </aside>
 
-      <section className="flex-1 lg:flex-none lg:w-96 min-w-0 flex flex-col border-e border-border">
+      <section className={cn("min-w-0 flex flex-col", showPreview ? "w-96 flex-none border-e border-border" : "flex-1")}>
         <div className="flex h-10 flex-shrink-0 items-center gap-2 border-b border-border px-3">
           <Search className="w-4 h-4 shrink-0 text-muted-foreground" />
           <input
@@ -126,7 +138,8 @@ export function SearchTabBody({ tabId, data }: SearchTabBodyProps) {
             kinds={kinds}
             flat={flat}
             selectedKey={selected ? hitKey(selected) : null}
-            onSelect={setSelected}
+            // No preview to fill: a click opens the hit, as its Open button would.
+            onSelect={showPreview ? setSelected : handleOpen}
             onOpen={handleOpen}
             onLoadMoreMail={loadMoreMail}
           />
@@ -139,9 +152,11 @@ export function SearchTabBody({ tabId, data }: SearchTabBodyProps) {
         </div>
       </section>
 
-      <aside className="hidden lg:block flex-1 min-w-0 overflow-y-auto">
-        <SearchPreview hit={selected} onOpen={handleOpen} onClose={() => setSelected(null)} />
-      </aside>
+      {showPreview && (
+        <aside className="flex-1 min-w-0 overflow-y-auto">
+          <SearchPreview hit={selected} onOpen={handleOpen} onClose={() => setSelected(null)} />
+        </aside>
+      )}
     </div>
   );
 }