Yes, you can delete 3D Viewer from your Windows 10 system if you don't use it and want to free up some space. To do this, you can uninstall the app through the Settings menu. Simply go to Settings > Apps > Apps & features, find 3D Viewer in the list of installed apps, and click on it. Then, select Uninstall and follow the prompts to remove it from your system. Keep in mind that while it's safe to delete 3D Viewer, it's always a good idea to be cautious when removing pre-installed apps, as they may be linked to other system functions. If you're not sure whether you should delete 3D Viewer, you can also choose to simply disable it instead of fully uninstalling it. This way, you can always re-enable it in the future if you find yourself needing it. By taking these steps, you can free up space on your Windows 10 system and customize it to better suit your needs.