You can enable the feature as a whole by clicking the Off checkbox under Night light. Windows feature for blue light reduction is called Night light. Right click on the Desktop and choose Display settings. If you have Windows 10 Creators update you can find Night light from the Control Panel. If you want to use something similar to Night light on Windows 7, Windows Vista or Windows XP, you can use Iris. Night light is not available for Windows 7. It was also available in the Windows 10 Insider preview before also. It comes built-in into Windows 10 Creators update. Night light is the Microsoft blue light reduction feature.
