Constantly dimming down IKEA lights by using a on/off switch

I bought a Tradfri light and a switch on off which I successfully integrated into my system.
I am able to switch the light on and off and also dim up / down when I continuously press the buttons.
However, it just decrease the brightness by one step. I would like it dimming down until the last step possible. How can I implement it?

This work wonders for me, but you will need a CC2531 USB Zigbee Dongle Module Sniffer or similar.

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What integration are you using ? Controlerx works with ZHA, zigbee2mqtt and deconz, and is a good option. But there might be alternatives.

If you use a ConBee II stick together with DeCONZ to integrate ZigBee devices, you can use a service provided by deconz that allows smooth dimming and stopping of dimming.