Sounds like you have set the second screen up as an extension to the lappy screen which is OK but remember to drag everything back off it before shutting down or it will be in limbo if you start up without a second screen.
If you only want to use the lappy as the "box" and keyboard and use the second screen as the "main" screen try connecting it before booting the machine then hold the FN key down and press F5. This allows you to change from lappy screen to external screen only or both screens showing the same stuff.
Good luck.
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