Indie defaults to showing prices for 1 adult in Economy class. Look below the cities you entered. After the search options you also see: “1 adult, Economy”. Click on that and change to the class of service you need. Then click continue .If you choose “Business” / First but there isn’t availability in that class for some flights, it will prompt you which leg is not available in this class. In this case, you can switch back to “economy” for the entire trip or just create a new trip for those legs and search “economy”.