How does Samsung T2556 set the unlock path of the pattern lock to be invisible?

This is a strange problem. I have never encountered this problem, but I have found this operation skill through tests. I will sort it out for your reference below. As shown in the following figure:

If you do not want to display the unlock pattern on the screen, follow these steps:

1. On the standby page, select application ].

 

 

2. Click set ].

 

 

3. Click device ].

 

4. Click lock screen ].

 

5. Remove the check box to make the image visible.

 

 

After setting, the screen will not be displayed if the unlock path is correct when the unlock pattern is drawn again.

 

 

Tip: This function can be implemented only after the screen pattern lock is set.

How to set screen pattern lock: [application]-[set]-[device]-[lock screen]-[screen lock]-[pattern]-draw an unlock pattern and back up the PIN code.