This also works on Windows 10 and 11, but it does not affect WindowsRT/Metro/Modern/UWP/Whatever apps. reg file will make the titlebar thinner, the titlebar text smaller, scroll bars thinner and the border padding as thin as possible.
I also think it looks nicer when it is reduced in size a little. I think Microsoft must have made the titlebars larger to make them more easily draggable when using a touch interface, but they just use unnecessary vertical space on a normal desktop or laptop computer, especially if it has a low resolution screen.
