Option 1:
1. Click Start (Windows button)
> Click Power button
> Click Shut down
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Option 2:
1. Right click Start (Windows button)
> Shut down or sign out
> Click Shut down
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Option 3:
1. Press Ctrl + Alt + Delete
> Click Power button
> Click Shut down
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Related Procedure:
How to Schedule Shutdown in Windows PC, please refer to this Guide