Right since XP days I always access Windows Advanced Appearance settings and change the windows color from white to light gray. The white is too bright for my liking. This setting used to change the backgrounds of all apps and was very useful. It did not work the same way in Win7 I think, but was good enough. Now in Win10 there is no such setting. I have changed the BG colors in Registry keys HKEY_CURRENT_USER>Control Panel>Colors and Desktop>Colors. This did change some background colors but not all. For example in Libreoffice or in browsers or in Thunderbird folder pane the color is still white. Is there a simple setting to change all the BG colors to custom color?