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probably for when you lock the door and have someone still in the car at the time.
second lock click if held also closes all windows
This only works on cars that have the 'total closure' feature. I'm not sure about the Scenic, but lower spec Lagunas certainly didn't have it. If you do have the feature, then deadlocking closes all of the windows and the sunroof (where fitted.)
If you don't like pressing the button twice, then one long press should deadlock the car too. As for the point of having deadlocks: One of the thieves' tricks on a non-deadlocked car is to pull out the top of the door frame so that they can reach in and open the door from the inside. This leaves the window frame permanently bent and usually breaks the paint. From a repair point of view, you'd be better off if they just broke the window.
Hopefully, if they're aware that the car has deadlocking, they won't even try it. So the fact that the car has deadlocks should work in your favour, even if you don't actually use them.
Currently in Horatio's garage:
2010 Laguna III Initiale.