diff --git a/datajunction-ui/src/app/components/NamespaceHeader.jsx b/datajunction-ui/src/app/components/NamespaceHeader.jsx
index b7503ec01..19856611f 100644
--- a/datajunction-ui/src/app/components/NamespaceHeader.jsx
+++ b/datajunction-ui/src/app/components/NamespaceHeader.jsx
@@ -1066,7 +1066,13 @@ export default function NamespaceHeader({
             (() => {
               const repoBranch =
                 gitConfig?.git_branch || gitConfig?.default_branch;
-              const editableBranch = gitShape === 'branch' && !isGitManaged;
+              // Editable = the branch root (shape `branch`) OR a sub-namespace
+              // of a feature branch (resolves as `flat`, no parent_namespace of
+              // its own, so `gitShape` alone misses it — same trap as the
+              // read-only verdict). Without isFeatureBranch these sub-namespaces
+              // fall through to the not-git "Connect to Git" button.
+              const editableBranch =
+                !isGitManaged && (gitShape === 'branch' || isFeatureBranch);
               const gitUrl = viewInGitUrl();
 
               // Read-only: fork to propose a change; everything else in the menu.
diff --git a/datajunction-ui/src/app/components/__tests__/NamespaceHeader.test.jsx b/datajunction-ui/src/app/components/__tests__/NamespaceHeader.test.jsx
index 7d740a1bb..65a20d281 100644
--- a/datajunction-ui/src/app/components/__tests__/NamespaceHeader.test.jsx
+++ b/datajunction-ui/src/app/components/__tests__/NamespaceHeader.test.jsx
@@ -795,6 +795,24 @@ describe('<NamespaceHeader />', () => {
         });
       },
     );
+
+    // Regression: same `flat`-shape trap on the git action button. A feature
+    // branch sub-namespace is editable, so it must show the "Sync to Git"
+    // control — not the not-git "Connect to Git" button.
+    it('shows Sync to Git (not Connect to Git) for a feature branch sub-namespace', async () => {
+      renderReadOnlyVerdict({
+        namespace: 'test.feature.metrics',
+        configByNamespace: {
+          'test.feature.metrics': branchCfg('feature', 'test.feature.metrics'),
+          'test.feature': branchCfg('feature', 'test.feature'),
+          test: GIT_ROOT,
+        },
+      });
+      await waitFor(() =>
+        expect(screen.getByText('Sync to Git')).toBeInTheDocument(),
+      );
+      expect(screen.queryByText('Connect to Git')).not.toBeInTheDocument();
+    });
   });
 
   it('should open Create Branch modal when button is clicked', async () => {