diff --git a/src/App.tsx b/src/App.tsx
index 3e67076..0da9eef 100644
--- a/src/App.tsx
+++ b/src/App.tsx
@@ -452,6 +452,32 @@ export default function App() {
   }, [tab, refreshSync]);
 
 
+  /**
+   * Point the app at `path` and bring the whole UI into line with it.
+   *
+   * Switching documents changes the entire library underneath every view, so
+   * refreshing the sync panel alone isn't enough: the path bar reads
+   * `status.library_path`, the sidebar reads `libStats`, and each tab is
+   * holding rows fetched from the *previous* library. Returns a short " — N
+   * cards, M decks" suffix so the caller can confirm what actually opened.
+   */
+  async function adoptDocument(path: string): Promise<string> {
+    setSync(await api.syncSetDocument(path));
+    // The path bar comes from get_status, which nothing else re-fetches.
+    setStatus(await api.getStatus());
+    setDeckRefreshSignal((v) => v + 1);
+    if (!readyRef.current) return "";
+    try {
+      const stats = await api.getLibraryStats();
+      setLibStats(stats);
+      return ` — ${stats.unique_cards} card${stats.unique_cards === 1 ? "" : "s"}, ${
+        stats.deck_count
+      } deck${stats.deck_count === 1 ? "" : "s"}`;
+    } catch {
+      return "";
+    }
+  }
+
   /** Choose where the library lives. Android grants a folder through the system
    *  picker (SAF has no path to hand back); desktop picks the JSON file itself. */
   async function pickLibrary() {
@@ -474,7 +500,8 @@ export default function App() {
       });
       if (typeof path !== "string") return;
       setSyncBusy(true);
-      setSync(await api.syncSetDocument(path));
+      const opened = await adoptDocument(path);
+      setSyncTest({ ok: true, message: `Opened ${path}${opened}.` });
     } catch (err) {
       setSyncTest({ ok: false, message: String(err) });
     } finally {
@@ -495,8 +522,8 @@ export default function App() {
       setSyncBusy(true);
       // Pointing at a file that doesn't exist yet moves the current library
       // there rather than starting empty — see sync_set_document.
-      setSync(await api.syncSetDocument(path));
-      setSyncTest({ ok: true, message: `Your library is now kept at ${path}.` });
+      const moved = await adoptDocument(path);
+      setSyncTest({ ok: true, message: `Your library is now kept at ${path}${moved}.` });
     } catch (err) {
       setSyncTest({ ok: false, message: String(err) });
     } finally {
@@ -795,12 +822,17 @@ export default function App() {
               </div>
             ) : tab === "add" ? (
               <CardEntry />
-            ) : tab === "library" ? (
-              <LibraryBrowser onOfferUndo={offerUndo} />
+            ) : /* Keyed on the library document: switching to a different one
+                   replaces every card, deck and id these views are holding, so
+                   they're remounted rather than left to reconcile state that
+                   belongs to a library that's no longer open. Stable across
+                   ordinary status refreshes, so it costs nothing otherwise. */
+            tab === "library" ? (
+              <LibraryBrowser key={status?.library_path} onOfferUndo={offerUndo} />
             ) : tab === "search" ? (
-              <CardSearch onOfferUndo={offerUndo} />
+              <CardSearch key={status?.library_path} onOfferUndo={offerUndo} />
             ) : tab === "decks" ? (
-              <DeckView refreshSignal={deckRefreshSignal} />
+              <DeckView key={status?.library_path} refreshSignal={deckRefreshSignal} />
             ) : (
               // The per-install status page: card data, library sync, and the
               // collection summary. On mobile it's the only home for the