If you forget to lock your PC or tablet when you step away, Windows Hello can use a phone that's paired with your device to automatically lock it shortly after you're out of Bluetooth range. To set things up, you’ll need to use Bluetooth to pair your phone with your PC and select the check box under Dynamic lock.
Use Bluetooth to pair your phone with your PC. Learn how to pair devices using Bluetooth.
On your Windows 10 PC, select the Start button > Settings > Accounts > Sign-in options.
- Under Dynamic lock, select the Allow Windows to automatically lock your device when you're away check box.
Take your phone with you when you move away from your PC, and it will automatically lock a minute or so after you're out of Bluetooth range. (Note that Bluetooth range varies by devices.)