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System Preferences on your Mac
System Preferences is where you personalize your Mac mini settings. For example, use Energy Saver preferences to change sleep settings. Or use Desktop & Screen Saver preferences to add a desktop background or choose a screen saver.
Customize your Mac mini. Choose Apple menu 
Update macOS. Click the System Preferences icon 
in the Dock, then click Software Update to see if your Mac is running the latest version of macOS software. You can specify options for automatic software updates.