Hi
brunohpcarvalhoThank you for your asking. My ZA550KL on Android 8 WW-15.00.2004.111 has "Night Light".
Please check Setting>Display>Night Light
If your Night Light option is disappeared, kindly try some stay-at-home troubleshooting tips below:
1. Settings>Apps & notifications>See all apps>3 dots on the top row>Reset app preferences
2. Also, please try "the Factory Reset"
Settings>System>Reset options>Erase all data(factory reset)
Please note that once the Factory Reset is completed, all data, apps, settings and personal information will be deleted.