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Looks like a random issue caused by .NET framework and it has been reported by others several times before.
I had that some months ago as well: Windows 10 Insider build 14279 vs. igfxCPL
It went away after some Windows updates.
Did you receive automatic Windows updates yesterday ("security Tuesday")?
Yes I did receive that update, it did not solve the problem I'm afraid.
Every time my machine goes through a major update, it rolls back to adaptive lighting = on.
I can't remember how I managed to turn it off the last few times.
So I guess this is a Microsoft issue and not Intel..
So I found a thread somewhere, suggesting a certain numbering format was messing with the Intel settings GUI.
This worked for me but I'm not sure it's a universal "fix".
1. Go to: Change date, time and number formats.
2. Change decimal symbol from comma to dot.
3. Intel's option GUI is correctly displayed now.