Samsung SM-S921W User Manual page 196

Appendix
4
Adjust the size of the frame or draw a line around an area that you want to restrict.
5
Tap Done.
The device displays the restricted area. The restricted area will not react when you
touch it and the device's buttons will be blocked. However, you can unblock functions
for the Side button, Volume button, and keyboard in interaction control mode.
To turn off the interaction control mode, press the Side button and the Volume Up
button simultaneously.
To set the device to lock the screen after turning off the interaction control mode, open
Settings, tap Accessibility → Interaction and dexterity → Interaction control, and then
tap the Lock screen when deactivated switch to turn it on.
Touch and hold delay
Set the recognition time for touching and holding the screen.
Open Settings, tap Accessibility → Interaction and dexterity → Touch and hold delay,
and then select an option.
Tap duration
Set the duration you must touch the screen for the device to recognize it as a tap.
Open Settings, tap Accessibility → Interaction and dexterity → Tap duration, tap the
switch to turn it on, and then set the time.
Ignore repeated touches
Set the device to recognize only the first tap within a set time when you tap the screen
repeatedly.
Open Settings, tap Accessibility → Interaction and dexterity → Ignore repeated
touches, tap the switch to turn it on, and then set the time.
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