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It sounds like you have dark mode set up to turn on as scheduled. The default schedule is sunrise and sunset. We can also set up a custom time.
System settings, display, underneath the dark mode/ light manual selections you should see an item titled Dark Mode Setting. Select that and the scheduled time settings will appear.
You are always welcome. It doesn't really look like a setting menu to me either. Looks more like it's indicating the two options above are the dark mode options.
Have a great day,