Hi there! I understand you're having trouble exiting build mode in the Aha World app after adding your items, and there’s no warning or option showing up to exit. Let’s see if we can get you out of that mode.

To help me guide you best, could you let me know:
- Are you clicking any particular button to try and exit build mode?
- Is the interface completely frozen, or do you still have access to menus or other controls?
- Have you tried any steps so far, such as restarting the app or your device?

Meanwhile, here are some general steps that often resolve this kind of issue:

1. Look for an Exit or Save button: Sometimes the exit option is a small icon or located in a corner/menu. Try checking top or bottom bars carefully.

2. Try the Escape Key: Pressing the Escape (Esc) key on your keyboard often exits build or edit modes in similar apps.

3. Reload the Interface: If no buttons respond, try refreshing the app or web page if it’s web-based. Save your work if possible before this.

4. Check for Background Processes: Close extra programs or browser tabs that might interfere with the app’s performance.

5. Clear Cache or Temporary Files: Sometimes cached files cause UI glitches; clearing those via browser settings or app settings can help.

6. Restart the App or Device: As a last resort, closing and reopening the app or rebooting your PC might refresh the state and allow you to exit build mode.

If these don’t work, there is a known issue where games or simulation apps sometimes freeze in build mode due to corrupted lot data or UI glitches. A community workaround for similar problems is to bulldoze or remove problematic elements from the build area (if available) or try loading a different project to see if the issue persists1.

Could you try these and tell me what happens? If the problem remains, we might need to look deeper into your app version or user profile data.

Are you able to try these now?