System Settings is macOS’s main control panel for configuring many device-wide preferences, such as privacy, security, network, and user-access options. Some controls are instead located in individual apps or features such as Screen Time, so changing one setting may not fully disable a capability everywhere.
In cybersecurity, System Settings matters because configuration choices affect how a Mac behaves and what services or features are available. Administrators and users should verify the relevant controls after making changes, especially when disabling features or using third-party utilities that modify settings. A setting being switched off does not by itself prove that related data or components have been removed.