Sync property values between Contact, Company and Deal Records

I would really like to be able to view a Contact’s phone number and email while working in their Deal record. Right now it only displays their email. Is it possible to customize that section on the Deal Record so that I don’t have to keep clicking back and forth between Deals and Contacts just to grab a phone number? It is easy to customize the ‘About’ section, but I couldn’t figure out how to customize the ‘Contact’ section.

Thanks!