Garmin Edge help - smoothing power

Ive just got my new Edge unit, how do I change the smoothing on the power output? Just getting back into training using power zones and currently its set to average power over 3 seconds - how do I change this? id like it to be longer while I get back into it. Thanks
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Press the screen on your Pwr 3s field. When it changes colour release and you will be in the Data Fields options,
Scroll down to Power & tap on it, then again scroll down to your chosen field 'Power 30 Avg' or whatever & tap on it. This should take you back to your original screen
hope that makes sense!?
Power output longer than 3 seconds is a bit laggy and quite useless as you ride