close laptop lid but leave running

I have a new Dell Inspiron 15, 7000 series laptop.  I have an external monitor hooked up to it.  When I close the lid on the laptop I want it to stay powered up and have the display still on the external monitor.

I can't figure out how to do this.  Can someone help?
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If you have windows OS, the go to power options Management, and change the setting
I would like to provide you with some screenshots but I'm not using my laptop now, the scenario you have I already use it for years

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SteveL13Author Commented:
Am using windows 8.1 and can't find a setting that will allow this.
sorry I have window 7, but search for power options , show plan options , check if there is show hidden options or advanced options, you should have a list of all options
SteveL13Author Commented:
I found it.  Thank you.
J NCommented:
Here's where to go in the control panel of windows 8.
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