Use a dynamic desktop. When you use a dynamic desktop picture, the desktop picture automatically changes to match the time of day in your location. Click Wallpaper in System Settings, then choose a picture for Dynamic Desktop. To have your screen change based on your time zone, enable Location Services. If Location Services is turned off, the picture changes based on the time zone specified in Date & Time settings.
Stay focused with Dark Mode. You can use a dark color scheme for the desktop, menu bar, Dock, and all the built-in macOS apps. Your content stands out front and center while darkened controls and windows recede into the background. See white text on a black background in apps such as Mail, Contacts, Calendar, and Messages, so it’s easier on your eyes when you’re working in dark environments.