Why there are 2 settings provided for Light and Dark Themes, one for for app mode and other for windows mode?

Question

I want to know why Microsoft has provided 2 settings for light and dark themes in windows 10, one for app mode and other for windows mode? I mean there should only be 1 setting for light and dark theme, light mode should turn everything light, dark should turn everything dark, why was there a need of 3rd custom option to put different themes on app mode and windows mode? What were Windows 10 designers thinking before providing 3rd custom option for theme? I know I can turn everything light and dark by clicking on light and dark options but my question is why was there a need to provide 3rd Custom option?

Answer 1

@Rahul Roy Verma
Hi,
These changes are based on Windows Insiders’ feedback.
Detailed suggestions like these helped the team move from a basic dark theme into the kind of functional design that users demand with applications like File Explore.
For your reference:
https://blogs.windows.com/windowsexperience/2019/04/01/windows-10-tip-dark-theme-in-file-explorer/
Windows 10 gives you the option to personalize the color and accent color of a variety of surfaces you see when you use Windows.
The Custom mode gives you more options somewhere in between light and dark. You can choose an accent color or have Windows select one (the accent color will provide a contrast with or match your wallpaper and Windows color).
You can also show an accent color for window title bars (the horizontal bar at the top of a window) and borders. Play around with the colors and modes to see which ones work best for you.

Hope above information can help you.

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Answer 2

You could set the default Dark or Light but sometimes users want to do more and have more option would enhance the user experience and user has better flexibility.