Oshim Many thanks. I got a grasp of what you mean now. However, I am not given the option to change the color depth (or I do not know where to find that parameter) in the NVIDIA Control Panel. I believe that by default the OS determines what graphics processor is to be used, and the display is controlled by the integrated graphics.
I see that in principle it is possible to select the GPU for each application. I was unaware of that. It looks like all applications except NVIDIA Control Panel and Adobe Acrobat rely on the Intel GPU.
Do you set your computers differently, i.e., do your displays use the NVIDIA GPU?
Cheers.