Windscreen demist procedure

[Lyons]

In previous cars I usually just put the air flow to the upwards position and this was enough to demist the windscreen unless it was really bad, in which case it needed a quick blip of the the full windscreen demist setting.

On the A8, the screen really only clears when I hit the demist button. It's a bit of a pain having to hit it all the time in bursts rather than having a more gentle continuous flow in an alternative setting.

Is there a way round this that I'm missing? There doesn't seem to be away to have the demist button activated but reduce the fan.