RELATED: How to Turn Off (or Customize) Sound Effects in Windows RELATED: How to Enable Dark Mode in Windows 10Īt the bottom of this screen, you can choose your default “app mode” to select between Windows 10’s built-in Light and Dark themes for applications. If you want your theme’s accent color used for your window title bars, you’ll need to scroll down on the Color screen and enable the “Title bars” option under “Show accent color on the following surfaces.” If you don’t, Windows 10 will use its default white title bars.