Changing the Proofing Format

To change the proofing format, use the Use As Proofing Format button below it. A "Used for Proofing" sticker will appear on the card to confirm the change. If the Use As Proofing Format button is disabled, the format you've selected is already the proofing format, or the format you've selected is not a proofing format. (In that case, you probably want to set it as your default format instead.)