How do I access and change the basic settings such as end signal volume and display brightness?

Bosch WDU28...GB / WDU28...SN ·

To access the basic settings, touch and hold the Silent (Á) button for approximately 3 seconds. From there, you can adjust the volume of the end signal (positions off, quiet, medium, loud, very loud), the volume of the button signal, the brightness of the Touch-Display (levels 1–4), and switch the Drum Clean information signal on or off. Use the corresponding buttons to navigate and adjust each setting. (Page 41-42)

Source: WDU28...GB / WDU28...SN Manual, Page 41

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