ローカルデータの削除

1. Optional: export a backup first (Settings → Back up) if you want to keep a copy
2. Open Settings on your device
3. Go to Apps or Application Manager
4. Find and select Voxbil: Invoice Maker
5. Tap Storage, then Clear data — or uninstall the app
6. Uninstalling permanently deletes all on-device business data.

クラウドデータの削除

1. Voxbil stores nothing in the cloud — there is no cloud copy to delete.
2. If you exported zip backups yourself (Settings → Back up), delete those files wherever you saved them (your drive, computer or chat app).