Based on this site, I think the setting you're searching for is

window.autoDetectColorScheme

To activate it, follow these steps :

1. Open your settings at JSON format
2. Add the following line :

"window.autoDetectColorScheme": true,

3. (Optional) If you want, you can also choose your favourites themes, depending on the color scheme.

"workbench.preferredLightColorTheme": "YourPreferredLightTheme", "workbench.preferredDarkColorTheme": "YourPreferredDarkTheme",

4. Save your settings.json file