The M15 is rated for VR, so at least one output would have to be directly controlled by the NVIDIA GPU, but that doesn’t mean all of them are. It’s possible that if you connect an external display, those options would become available, although that obviously doesn’t change the picture for the built-in display - and even with external displays you might find that it depends on the output you use. That probably also explains the color and brightness controls in NVIDIA Control Panel (or lack thereof). Some such technologies include stereoscopic 3D, VR, G-Sync, and 5K resolution - and apparently maybe Adaptive V-Sync.
But the downside to this design is that there are certain technologies that Intel GPUs don’t support passing through and/or that require the NVIDIA GPU to have direct control of the display output. The benefit to this design is primarily battery life, because it allows the NVIDIA GPU to be completely disabled when it’s not needed, whereas if it directly controlled the display output, it would have to be on whenever a display connected to that output was in use, even if nothing graphics-intensive was going on. Instead, the Intel GPU is wired to the output, and when the NVIDIA GPU’s horsepower is required, it acts as a render-only device that passes completed video frames to the Intel GPU for output to the display. That means that the NVIDIA GPU is not physically wired to the display output. I believe the reason that option and several others you’re used to aren’t available is because the Alienware M15 uses an NVIDIA Optimus setup for the built-in display, and possibly some of the built-in display output connectors. It’s not like G-Sync where the display itself has to support a variable refresh rate to match the frame rate of the game. That option just dynamically switches V-Sync on and off based on load. There’s nothing about Adaptive V-Sync that requires support from the display.
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