Samsung SM-N950F/DS User Manual page 278

Appendix
Direction lock
Create a directional combination to unlock the screen.
1
Launch the Settings app, tap Accessibility → Advanced settings → Direction lock, and
then tap the switch to activate it.
2
Drag your finger up, down, left, or right six to eight times, and then tap Continue.
3
Draw the direction combination again to verify it and tap Confirm.
Installed services
View accessibility services installed on the device.
Launch the Settings app and tap Accessibility → Installed services.
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