Open the “pen tablet setting-button” windows.
1. Choose the button 1 or 2
2. Set the default to the pen/eraser toggle.
3. Click Apply and OK buttons to exit.
When the digital pen is in working mode, press the barrel button to switch from pen/eraser mode. The screen will indicate current pen/eraser mode. You may assign the barrel button to a different action in the Pen Tablet button settings.