Senpai_Mizu is indeed correct (consider your forum reputation added to in spirit, apparently I have to spread some reputation around before I can approve your comments) , this is a Windows settings. To enable custom colourisation of title bars make sure that "Start, taskbar and action centre" in Settings -> Personalisation -> Colours -> "Show the accent colour on the following surfaces" is checked.
Thank you for using DarkenTS!![]()