KDE allows you to change the screen's color temperature with the Night Color option. This is equivalent to Night Shift in iOS, iPadOS, and macOS or Night Mode in Android. It is used to reduce eyestrain by using a warmer color temperature to filter blue light.
Night Color can be configured from System Settings. You have both the color temperature and time as options.
Open
System Settings from the application launcher.

Click on
Display and Monitor on the sidebar menu.

Go to
Night Color configuration panel.

Click on
Activate Night Color checkbox to enable
Night Color.

Slide to set the color temperature.
Click on the
Activation Time select list.

Select or set the time period to enable
Night Color.

Click on the
Apply button to activate and save the configuration.

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