I’ve got a bit of experience with NVIDIA Optimus laptops on Linux so here’s some questions:
What exactly is the problem?
Are games not running on NVIDIA?
In this case you need to add an environment variable to the launch options in steam, the name of which has escaped me (should be on OPTIMUS page of Arch wiki)
Or is the driver not working at all?
What desktop environment/wm are they using?
For example if you’re using GNOME in the settings program in the about the system section (the last one) and in the System information dialog check to make sure it says something like “NVIDIA GTX 1050 Mobile”. Also make sure the NVIDIA driver program shows up with the other apps