The No. Printed field is just showing you how many times users' have selected Print/Send > Print....:
You can't reverse a print as someone has already printed it, in this case twice.
Is there a particular reason you want it to revert to show as only printed once? This field is typically just for information purposes. If you wanted to modify it a developer would have to change it but that's not recommended. Are documents showing as printed twice even when you print once?
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