https://answers.microsoft.com/en-us/windows/forum/windows_10-start/chan…
Generally editing that value is not currently exposed via a user interface. If you're more technical: what are the values under:
HKEY_CURRENT_USER\Control Panel\Desktop\Colors
Másik komment:
I changed
HKEY_CURRENT_USER\Control Panel\Colors\Window
to the colour I wanted (250 250 210, Light Goldenrod Yellow), logged out and back in, and the window background in apps including Notepad changed.