How do we update Transactional emails and Broadcast emails to be sent from our brand domain?

We would like to know if it’s possible to configure transactional and broadcast emails under "Essential Config > Core" to be sent from our own brand domain (e.g., [email protected] \ [email protected]) instead of the default domain used by your platform. This is currently greyed out for us. If this is supported, please let us know the steps required to set this up and any additional requirements.

Thank you for your assistance!