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The Windows Start button and search box are now located in the center at the bottom (instead of bottom far left). When you click the Windows Start button, it shows you pinned apps and recommended files, but you can click the “All” button in the upper right to get to the full alphabetic listing of applications. In the bottom lower right corner of that Start menu, is where you will now find the Power button to Lock, Sleep, Shutdown or Restart the computer.
Meet Windows 11: A whole new look - Microsoft Support
Connecting laptop to monitor(s) for the first time after Windows 11
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