Heya!
This is not possible on this machine as of yet, they do have a ticket up for it, which means this may change in later firmware releases.
Though, right now you just have to click on the "Clear All" button.
Thanks!
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On some models, like the WC56xx, there is a way to enable autoclear address book after start is pressed for a fax. Can you do the same for a WC75xx?