Use Your Phone to Lock Your Windows 10 PC

Windows 10 contains a feature called Dynamic Lock. Microsoft considers Dynamic Lock to be part of Windows Hello technology. Dynamic Lock uses a Bluetooth connection with your smartphone to understand when you are in and out of range of your PC. When your smartphone exits Bluetooth range, the PC will lock automatically.

To do this:

1.  First, use Bluetooth to pair your phone with your PC.

Go to Settings  > Devices > Bluetooth. Turn on Bluetooth > select the device > Pair.

2.  After the smartphone has been paired with your PC, next go to Settings  > Accounts > Sign-in options.

3.  Under the Dynamic lock area, select the Allow Windows to detect when you're away and automatically lock the device check box.

Now, when your smartphone leaves Bluetooth range of your PC it will automatically lock after about a minute.

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Source: Use Your Phone to Lock Your Windows 10 PC