diff --git a/docs/reference/keyboard-shortcuts.md b/docs/reference/keyboard-shortcuts.md
index 49377c5..8b74257 100644
--- a/docs/reference/keyboard-shortcuts.md
+++ b/docs/reference/keyboard-shortcuts.md
@@ -1,15 +1,16 @@
 # Keyboard shortcuts
 
-All shortcuts are active in the interactive TUI. Keys are **case-sensitive** and must be typed in lowercase.
+All shortcuts are active in the interactive TUI. Keys are **case-sensitive** — most use lowercase letters, but a few bindings (such as `Z` and `G`) require an uppercase letter.
 
 ## Navigation
 
-| Key       | Action                                |
-| --------- | ------------------------------------- |
-| `↑` / `k` | Move cursor up (repos and extracts)   |
-| `↓` / `j` | Move cursor down (repos and extracts) |
-| `←`       | Fold the repo under the cursor        |
-| `→`       | Unfold the repo under the cursor      |
+| Key       | Action                                                                                     |
+| --------- | ------------------------------------------------------------------------------------------ |
+| `↑` / `k` | Move cursor up (repos and extracts)                                                        |
+| `↓` / `j` | Move cursor down (repos and extracts)                                                      |
+| `←`       | Fold the repo under the cursor                                                             |
+| `→`       | Unfold the repo under the cursor                                                           |
+| `Z`       | **Global fold / unfold** — fold all repos if any is unfolded; unfold all if all are folded |
 
 Section header rows (shown when `--group-by-team-prefix` is active) are skipped automatically during navigation.
 
diff --git a/src/render.test.ts b/src/render.test.ts
index 3e33c48..9f29bcc 100644
--- a/src/render.test.ts
+++ b/src/render.test.ts
@@ -902,6 +902,13 @@ describe("renderHelpOverlay", () => {
     expect(stripped).toContain("Filter mode:");
   });
 
+  it("documents the Z global fold/unfold shortcut", () => {
+    const out = renderHelpOverlay();
+    const stripped = out.replace(/\x1b\[[0-9;]*m/g, "");
+    expect(stripped).toContain("Z");
+    expect(stripped).toContain("fold / unfold all repos");
+  });
+
   it("is returned by renderGroups when showHelp=true", () => {
     const groups = [makeGroup("org/repo", ["a.ts"])];
     const rows = buildRows(groups);
@@ -968,6 +975,14 @@ describe("renderGroups filter opts", () => {
     expect(stripped).not.toContain("Filter:");
   });
 
+  it("status bar hint line includes Z fold-all shortcut", () => {
+    const groups = [makeGroup("org/repo", ["a.ts"])];
+    const rows = buildRows(groups);
+    const out = renderGroups(groups, 0, rows, 40, 0, "q", "org", {});
+    const stripped = out.replace(/\x1b\[[0-9;]*m/g, "");
+    expect(stripped).toContain("Z fold-all");
+  });
+
   it("shows mode badge [content] when filterTarget=content", () => {
     const groups = [makeGroup("org/repo", ["a.ts"], false, true)];
     const rows = buildRows(groups, "code", "content");
diff --git a/src/render.ts b/src/render.ts
index 0e96728..91a3032 100644
--- a/src/render.ts
+++ b/src/render.ts
@@ -33,6 +33,7 @@ export function renderHelpOverlay(): string {
     bar,
     `  ${pc.yellow("↑")} / ${pc.yellow("k")}       navigate up            ${pc.yellow("↓")} / ${pc.yellow("j")}       navigate down`,
     `  ${pc.yellow("←")}           fold repo              ${pc.yellow("→")}           unfold repo`,
+    `  ${pc.yellow("Z")}           fold / unfold all repos`,
     `  ${pc.yellow("Space")}       toggle selection       ${pc.yellow("Enter")}       confirm & output`,
     `  ${pc.yellow("a")}           select all             ${pc.yellow("n")}           select none`,
     `                 ${pc.dim("(respects active filter)")}`,
@@ -297,7 +298,7 @@ export function renderGroups(
 
   lines.push(
     pc.dim(
-      "← / → fold/unfold  ↑ / ↓ navigate  spc select  a all  n none  f filter  t target  h help  ↵ confirm  q quit\n",
+      "← / → fold/unfold  Z fold-all  ↑ / ↓ navigate  spc select  a all  n none  f filter  t target  h help  ↵ confirm  q quit\n",
     ),
   );
 
diff --git a/src/tui.ts b/src/tui.ts
index 8f269a7..990c0a0 100644
--- a/src/tui.ts
+++ b/src/tui.ts
@@ -389,6 +389,29 @@ export async function runInteractive(
       }
     }
 
+    // `Z` — global fold / unfold: fold all if any repo is unfolded, else unfold all
+    if (key === "Z") {
+      const anyUnfolded = groups.some((g) => !g.folded);
+      for (const g of groups) {
+        g.folded = anyUnfolded;
+      }
+      // Adjust scroll so cursor stays aligned with the same repo after bulk fold.
+      // When folding, extract rows disappear: map the current row's repoIndex to
+      // its repo header row so the cursor does not jump to a different repository.
+      if (anyUnfolded) {
+        const newRows = buildRows(groups, filterPath, filterTarget, filterRegex);
+        if (row && (row.type === "repo" || row.type === "extract")) {
+          const headerIdx = newRows.findIndex(
+            (r) => r.type === "repo" && r.repoIndex === row.repoIndex,
+          );
+          cursor = headerIdx !== -1 ? headerIdx : Math.min(cursor, Math.max(0, newRows.length - 1));
+        } else {
+          cursor = Math.min(cursor, Math.max(0, newRows.length - 1));
+        }
+        scrollOffset = Math.min(scrollOffset, cursor);
+      }
+    }
+
     if (key === " " && row && row.type !== "section") {
       if (row.type === "repo") {
         const group = groups[row.repoIndex];