Where is the domain settings?

System wide settings or email settings do not contain how to change domain to something.com instead of 127.0.0.1

Check your config.php, values host_name and site_url

Check also if they happen to be redefined in your config_overrride.php

i hoped they would be in the actual config interface

They are, but during installation only.

i dont remember seeing anything like that

URL of SuiteCRM Instance on Step 2 of the configuration wizard of the installer.