Although the stable Android Oreo firmware for the Nokia 3 smartphone brings a faster boot time, autofill, picture-in-picture mode, Instant Apps, Google Play Protect, and the April security patch, it also takes away a feature that was present in the latest beta, namely the Night Light mode.
https://www.notebookcheck.net/Android-Oreo-stable-hits-Nokia-3-in-India-the-Night-Light-feature-is-now-gone.299256.0.html