f.lux disables at 9:30 pm daily
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Every day at precisely 9:30 pm, my screen goes completely back to full-on bright, then slowly gets back to the color it was before 9:30. It doesn't matter what app I'm in when it happens. Switching between apps darkens the color for a second but it doesn't stay that way. This has been happening for at least a year, and I haven't had time to ask about it, but it is really a problem to be blasted with bright light at that time of night. I'm on the latest version and I've tried changing some settings, but nothing seems to help.
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Turn off the Windows Night Light feature. It's in the System section of the Settings app.