diff --git a/public/js/auth.js b/public/js/auth.js
index 6fec67f0..975d748d 100644
--- a/public/js/auth.js
+++ b/public/js/auth.js
@@ -202,6 +202,10 @@ document.addEventListener('DOMContentLoaded', function() {
   function enterPreview() {
     document.body.classList.add('assistant-preview');
     if (authScreen) authScreen.style.display = 'none';
+    // The app container starts hidden and enterApp is what reveals it. Declining
+    // the overlay without doing the same left a hidden app under a hidden
+    // overlay — /assistant in the address bar and nothing on the screen.
+    if (mainApp) mainApp.style.display = 'block';
     if (typeof window.activateTab === 'function') window.activateTab('assistant');
   }