The dimmer mode and the switch mode are selected changing the Parameter 5 – Working mode.

The default value is set to 0 - dimming mode. If you want the dimmer to act as a switch you must change the Parameter 5 to value 1. After you change the parameter you must exclude the Mini Dimmer (without resetting it) wait at least 30 seconds and then re-include the Mini Dimmer in the gateway.
After the re-inclusion is done, the device will work as a normal On/Off switch, without the possibility to dim and in the most of the cases the widget in your App will change.

Note: The Switch mode works properly only in a 3-wire installation - connection with the neutral line.