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 by clicking on the gear icon in the gray navigation bar.
2. Select Domains.
3. From here, all of your domains are listed, select the primary domain by toggling the button under the Primary column. If the domain is selected and the button is shown in blue, that means it is activated and set as the primary domain.