What can I do if my phone screen become black item?
Your screen will become black in dark mode, which makes it easier to look at your screen or read in dim light.
1) Go to “Settings”->”Display”->touch “Dark mode”->touch the trigger to activate /deactivate it.
2) Drag down quick settings bar in any interface ->touch "Dark mode" to activate/deactivate it (slide to the below to view it in the second page).