Important: Ensure that you connected the Razer Raptor 27 | RZ39-02760 to your system via the included DisplayPort cable. If your GPU’s DisplayPort is already being used by another monitor, the USB-C port will also accept a DisplayPort 1.4 signal, in addition to enabling the Raptor’s USB-A pass-through ports.
Step-by-step process on how to set the Razer Raptor on 144 Hz refresh rate
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Go to Settings > System > Display > Advanced display settings.

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Choose the Razer Raptor from the dropdown menu and click “Display adapter properties”.
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Click on the “Monitor” tab and select “144 Hertz” from the screen refresh rate dropdown menu.

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Click “OK” to save settings.