To use the native titlebar in VS Code, set the setting "Window: Title Bar Style" to "native" ("window.titleBarStyle": "native").
VS Code Default Light.colors(For "Light+", "Light", and "VS2019 Light")
VS Code Quiet Light.colors
VS Code Solarized Light.colors
VS Code Default Dark.colors(For "Dark+", "Dark", and "VS2019 Dark")
VS Code Abyss.colors
VS Code Kimbie.colors
VS Code Monokai.colors
VS Code Monokai Dimmed.colors
VS Code Red.colors
VS Code Solarized Dark.colors
VS Code Tomorrow Night Blue.colors
If a titlebar theme is missing for a VS Code community theme you use, please feel free to request or contribute it!
VS Code Erins Theme Dark.colors(For my personal theme!)