Night Light on Nougat

[RoyalS]

I usually use phone late at night so i really want to have a "Night Light" function in my Xperia XA. I have tried here:

https://android.gadgethacks.com/how-to/enable-hidden-night-mode-setting-android-7-0-nougat-0173311/

but it doesn't work. Anybody have tried this and if it work, please help me. 
Thanks a lot.

Have a nice day.

[Maometto_Popo · Accepted solution]

try again after restart the phone

it's working wuth me (F3212)

[Krishna2136]

Download this app from play store to enable night mode. After enabling drag the notification bar and there you can see edit option.after touching it u will see night mode options right in notification bar..

Thanks 

[RoyalS]

Can you please help me step by step? 
Tks a lot.

[RoyalS]

The picture isn't show up. Can you write the app's name??
Tks

[Krishna2136]

Night mode enabler