Locking your PC protects it from unauthorized use when you need to step away from the PC, and don’t want to sign out or shut down.
When the computer is locked, you will be taken to the lock screen by default to dismiss and sign in when ready to continue where you left off. Other users can still sign in to their accounts from the sign-in screen.
Windows Hello can use any paired iPhone, Android or Windows Phone to detect when you step away from your PC or tablet, automatically locking it behind you for an extra measure of security and privacy. This remote lock feature works with smartphones, fitness bands or any device that’s paired to your PC or tablet.
Starting with Windows 10 build 15002, Microsoft has added a new Dynamic Lock (aka: “Windows Goodbye”) feature that allows Windows to detect when you’re away and automatically lock the device.
Starting with Windows 10 build 15031, Microsoft officially introduces Dynamic Lock. Dynamic Lock automatically locks your Windows 10 PC when you’re not around based the proximity of a Bluetooth-paired phone. If your Bluetooth-paired phone is not found near your PC, Windows turns off the screen and locks the PC after 30 seconds.
Starting with Windows 10 build 17093, Microsoft made it easier for users to protect their identity when signing in to Windows with the new Account Protection pillar in Windows Defender Security Center. Account Protection will by default notify Dynamic lock users if Dynamic lock has stopped working because their phone or device Bluetooth is off.
This tutorial will show you how to turn on or off notifications when there are problems with Dynamic Lock for your account in Windows 10.