The Retina display offers scaled resolutions. These allow you to have text and objects appear larger and more visible, or smaller, which provides more space for windows and apps. Your Mac will show either four or five scaled resolution options depending on its model. Retina displays use scaled resolutions rather than the specific resolution settings that external displays use. If you need to use a different resolution than those available on the built-in display, attach an external display via HDMI, Thunderbolt, or DisplayPort.You can adjust the resolution of your display, choose System Preferences from the Apple menu. Get more : https://istorestm.com/why-is-the-retina-display-better/