Hi @TimBaker,
Thank you for your question! Unfortunately, there isn't a global setting in Proofing HQ that allows you to set this option as checked by default for all proofs.
This setting is only available at the individual proof level. I would recommend submitting an idea to our innovation lab if you'd like to see this functionality available in the future of Workfront.
https://experienceleague.adobe.com/en/docs/workfront/using/basics/tips-tricks-for-basics/idea-exchan...
- Monica