How can I configure BlueStacks to have Android use dark mode? How can I configure BlueStacks to have Android use dark mode?
On Android 10 I can use:

but I can't see the option on Android on BlueStacks:
The simple answer is you can't.
BlueStacks 4.2 bases on Android Nougat - also known as Android 7.x and therefore there is no Dark Mode.