Samsung Galaxy Book Quick Start Manual page 6

Security
Lock and Unlock your Device
Press the Power key to turn off the screen and lock it.
◆ To lock your device, press and hold the Power/Lock key.
◆ To unlock your device, press the Power/Lock key and then drag the locked
screen upward.
To prevent others from accessing your personal information, change your device
security feature.
◆ On the taskbar, tap
then select a screen lock method.
Start > Settings > Accounts > Sign-in options, and
5