If the option isn't present, it seems it isn't allowed to disable the integrated GPU...
Do you have Nvidia control panel installed?
If no, install it.
From there, it seems there's an option to select all programs for using Nvidia graphics card only: Manage 3D Settings, global settings, Preferred graphics processor, high-performance NVIDIA processor.
Do you have Nvidia control panel installed?
If no, install it.
From there, it seems there's an option to select all programs for using Nvidia graphics card only: Manage 3D Settings, global settings, Preferred graphics processor, high-performance NVIDIA processor.