To change the branding of your email unsubscribe and preference pages go to:
Settings > Channel Settings > Email Settings
Here you can:
- Choose to allow users to change their email in preferences
- The default is not allowed. Might be a requirement if email is only a newsletter list, if you have a login and customer records and are syncing email to the platform from your system of record should probably be left as default not allowed.
- Change the background color to a brand color
- Upload a brand logo for the header of the page
So from default generic look grey with background you can have pages like below. Something plain which matches the branding in your email footer is recommended.