Samsung Galaxy Z Fold4 User Manual page 19

Getting started
Lock or unlock your device
Use your device's screen lock features to secure your device. By default, the device
locks automatically when the screen times out. Learn more:
Devices and software are constantly evolving — illustrations are for reference only.
Lock screen and security
19
Side button
Press to lock.
Press to turn on the
screen, and then
swipe the screen
to unlock it.