Solved Adding Monitor to Laptop

Hello, trying to add a monitor to my laptop. I get a picture on both screen, however, when I close the laptop, I lose both screens. I have toggled every combination on the 'Display' screen in 'PC Setings' but haven't found the correct toggles as yet. Most of my periphials work(still adding) but not the display when I close laptop. Trying to make a desktop out of the laptop. I have it above me on shelf 18" above work area on a cooler/blower. Ideally, I want the laptop to come alive when opened, if and when I need to go to it for maintenance, etc. Where do I go to make my monitor the main screen? Monitor is a Samsung 24SD300. Thank you all for your help here!

Power Settings. As for Screen decision, that is under the Mobility Center.

Thank you! It was in the Mobility Center. Didn't even know it had a Mobility Center.....? You helped!

It is one of those hidden items in the Control Center. I tend to forget about it being there at times.