You have to set your maximum hardware reserved RAM ,basically your iGPU vram,in bios.
It's normal to have a small number show up in windows because it only shows you how much is being used at that moment you have to run something that takes up some vram to show the actual usage.
Also your laptop might have two GPUs one in the CPU and a discreet one in that case the discreet one might have some actual dedicated ram and not use any hardware reserved RAM at all.