GPU problem

[BlackWolf]

Hello guys!

So, my laptop plays disco with the integrated GPU. But it's lagging, so I want to change it to the high performance GPU. When I want to choose the NVIDIA GTX 950m, it says: "You're not able to choose the GPU in this menu. U have to change it in the NVIDIA control panel bla bla...."
I tried to do that, but it still starts with the integrated one, but it shows the high performance one in the options. Any ideas?

Thanks in advance.