Selecting a Primary Domain allows you to choose one domain as the main redirect point, meaning if you own multiple custom domains you can choose the site that best represents your business or organization.
1. Navigate to the Settings panel (gear icon) in the Dashboard
2. Select Domains under the Settings subnavigation
3. From here, all of your domains are listed, select the primary domain by clicking the star icon. Your primary domain will be indicated by this blue star and green Primary text.