In Power Options window, click Display -> Enable adaptive brightness, and turn on Windows 10 adaptive brightness.In the Edit Plan Settings window, you can click Change advanced power settings.Click Change plan settings next to your active power plan.Next click Additional power settings in the right window.You can click Start and type power options, click Power & sleep settings.And then check again if the adaptive brightness option shows in Display Settings window. If you want to enable adaptive brightness in Windows 10 from Display Settings window but find that the option is missing, you can make sure the Enable adaptive brightness option is enabled. How to Fix Windows 10 Adaptive Brightness Missing Still, if you encounter Windows 10 adaptive brightness not working or won’t turn off error, this post also offers some solutions to help solve this error. If you find Windows 10 adaptive brightness is missing and there is no adaptive brightness option in windows 10, try to fix this problem with the solution below. For other Windows issues, like data loss, partition management, system backup and restore, MiniTool software offers you feasible solutions. This post aims to help you fix Windows 10 adaptive brightness missing, and solve Windows 10 adaptive brightness not working or won’t turn off issue.