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