Something is filtering blue light and I can't figure out how to stop it
So I did a bit of digging and found two related threads describing your problem:

User Friendly Solution

As you've described you had transferred over your settings from a different device and the 'Night Light' settings were hidden by the Samsung software.

The most user friendly way is from Reddit:

PSA: Night Light and Blue Light Filter Overlap

where the solution is use Nova Launcher and to create a Night Light shortcut from Nova Launcher:


  Easy fix is through Nova Launcher / Activities. Press somewhere on the home screen so you can select widgets. From there select Activities>Settings>Night Light. Open Night Light from your home screen and turn it off - and the scheduling, too, of course... Unless you'd rather use Night Light.


Reddit author made a video for visual aid: https://youtu.be/J9J1B2Q8Eu4

Alternate ADB solution

In my research I also found a different way, and while it didn't help you perhaps it may help someone else:

Weird Night Mode type issue

The XDA one lists adb commands to try:

Using adb to list out device settings

adb shell 'settings list secure


and then attempting to clear the appropriate ones:

adb shell 'settings put secure night_display_activated 0'

adb shell 'settings put secure night_display_auto_mode 0'