m15 R4, Nvidia G-Sync in game Issue

Hi,

I just received my brand new Alienware m15 R4 last week. My panel is 144Hz with G-Sync & Advanced Optimus. However, as I tried to open Nvidia control panel and set up  G-Sync in game, I couldn't find the Display category either in the main dashboard or in the 3D Setting section. How do I enable my G-Sync in game and how do I know whether G-Sync is active or not?

Here the pic of my nvidia control panel:

Any suggestion would be great, thanks!