1. Open your Sunmi’s Settings. It’s the ⚙️ icon typically found in the app drawer/main screen.
2. Tap InnerPrinter.
3. Tap Print style setting
4. Switch ON the Line height
5. A new option will appear. Tap on Set the line height(px)
6. Define the line height to 0 (zero) and confirm
7. Done. The physical printer is configured ✅