This article refers to a feature on the updated dashboard which provides expanded options for customizing the layout and design of campaign pages. If you are using the previous dashboard (how can I tell?) and would like to upgrade (for free!), please contact our Support Team.
Universal Settings (found at the top of the Theme section of the dashboard) is where you can set the logo, default font, and default colors that are used across your campaign's pages.
Individual Pages Settings (the panel on the right of each page) only allow you to change the text and hero image used for that particular page.
This helps ensure a sense of visual consistency across the pages of your campaign so that your customers get a more pleasant user experience.