If you're having trouble seeing the 3D view on your iPad Mini, there are a few potential reasons for this issue. Here are some troubleshooting tips to help you get the 3D view working again:

1. Check Compatibility: Not all apps or websites support 3D view on iPad Mini. Make sure the content you're trying to view is indeed compatible with the 3D feature on your device.

2. Update Software: Outdated software can sometimes cause issues with displaying the 3D view. Check if there are any software updates available for your iPad Mini and install them if necessary.

3. Restart Device: Sometimes a simple restart can solve many technical issues. Try restarting your iPad Mini to see if the 3D view starts working afterwards.

4. Adjust Display Settings: Go to Settings > Accessibility > 3D & Haptic Touch and ensure that the 3D view feature is enabled. You can also try adjusting the display settings to see if it resolves the problem.

5. Clear Cache and Data: If you're trying to view 3D content in a specific app, clearing the app's cache and data might help. Go to Settings > [App Name] > Clear Cache/Clear Data to give it a try.

6. Reset All Settings: If none of the above solutions work, you can try resetting all settings on your iPad Mini. This will restore all settings to their default values, which may help resolve the 3D view issue.

7. Contact Support: If you've tried all the troubleshooting steps and the 3D view still isn't showing on your iPad Mini, it's best to reach out to Apple support or the app's developer for further assistance.

By following these troubleshooting tips, you should be able to identify and resolve the reason why the 3D view is not showing on your iPad Mini. Remember to always ensure that your device's software is up to date and that the content you're trying to view is compatible with 3D display. If all else fails, contacting support is the best course of action to get the issue resolved.