Click the screen that you want to be downscan. Once you click that screen the menu options on the right side will change. There will be an option that says "view", click that and select down. Should fix ya up
With combo screens with both SS & DS screen when building, the first screen is Screen1, second screen is Screen2. So later say, when you set Screen2 to DS, then all your combo Screen2's will be DS.
Screen1 will match with the setting of the full SS/DS screen.