Close Laptop lid, but keep monitor (Windows 10)

I have a not TD specific question. But maybe somebody has an idea to that.
In advance: Settings ‘choose what closing the lid does’ is already set to ‘do nothing’.

I have a laptop and an external monitor with Windows 10. I expand Monitor (Laptop) 1 to Monitor 2 (external). If I close the lid of the the Laptop, the Laptop monitor is switched of and Windows seems to switch it of, which results in having only one monitor (the external one).
Is it possible to keep the monitor arrangement even if closing the laptop?