Both Nvidia and AMD Laptops often have this but in Nvidia Control Panel ( right click the desktop and open it )...   Under 3D Settings>Manage 3D settings >   you should see a Preferred GPU drop down box at the top.....   you can also go upto Desktop on the Menu Bar and Check the Display GPU Activity Icon , so that if the Nvidia card is being used it will put a rainbow coloured icon next to the clock or on the hidden menu....drag it off the hidden menu and drop next to t