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There is an app I have been using for many years called twilight that you can set your light the way you want, also it gives you a better focus and blocks the blue light away, it is amazing feature that it blocks off the blue and gives you a much sharper look and it does auto tune your brightness, as well as even gives you a better option by switching off and on the default settings too. It never shuts itself off either, you are allowed to.
I have never encountered this error, but I recommend you to restart the operating system, I think this error will go away
I may be wrong, but isn't 'One-handed Screen' the same as mini view? I don't use it but they may have changed the name. It's under the Display setting. View attachment 154747
If that's not it, sorry. ¯\_(ツ_/¯