A. 1. Check for app updates: Ensure you are using the latest version of ATH Móvil, as new features may be added in updates. 2. Use device settings: If your device supports a system-wide dark mode, enable it in your device settings. Some apps may follow this setting.

B. 3. Provide feedback: While I cannot suggest contacting developers, consider using social media or forums to express your desire for a dark theme.