Samsung SM-J330F User Manual page 31

Basics
If the screen is locked, you must unlock it to view notifications.
Setting the schedule for the Always On Display feature
On the Apps screen, tap Settings → Lock screen and security → Always On Display, and
then tap the Show always switch to deactivate it. Then, tap Set schedule and set the start
time and end time.
Controlling music playback when the screen is off
You can control music playback when the screen is off, without turning on the screen.
1 On the Apps screen, tap Settings → Lock screen and security → Information and
FaceWidgets → FaceWidgets, and then tap the Music Controller switch to activate it.
2
To control music playback when the screen is off, double-tap the clock.
3
Tap the icons to control the playback.
31