This is a common limitation with systems that use DisplayLink docks. DisplayLink works through USB graphics compression, so your external monitors are driven by the Intel GPU rather than the NVIDIA card. Because the screens connected through the dock are not wired directly to the NVIDIA GPU, the NVIDIA control panel will always say that no display is attached.
Unfortunately there is no setting in DisplayLink that can force the NVIDIA card to become active for external monitors. The only reliable way to use the NVIDIA GPU for gaming is to connect at least one monitor directly to the laptop’s HDMI or DisplayPort so the screen is physically routed through the NVIDIA card.
If you want to game on the external screens, try connecting one monitor directly to the laptop and use the dock only for peripherals and the second display. This usually lets the NVIDIA GPU stay active.
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