Hello @Julian Coats
Thank you for reaching out on the community and telling us about your issue. The address set by check pay cannot be changed in our current system. If you would like to make this idea to be added to quicken I'll link a thread down below so showing how to do so. Ideas are reviewed by our development team to see what people would like to be available in the future. I do apologize for any inconvenience this has caused.https://community.quicken.com/discussion/7849425/creating-and-voting-for-ideas-in-the-community#latest
Thanks,
Quicken Francisco