When connecting a MacBook, it may not be possible to set HDR under the specification of 4K/2K@144Hz, and the "High Dynamic Range" button may not be available.

TCL monitors have obtained VESA HDR1400 certification, which can be verified on the VESA official website. If your MacBook cannot set 'High Dynamic Range' at 4K/2K@144Hz, you can try changing the connection method, preferably using Type-C. If 'High Dynamic Range' setting is still not supported, it might be due to the current signal bandwidth exceeding the maximum bandwidth limit supported by the graphics card. You can try lowering the resolution or refresh rate to enable 'High Dynamic Range'.

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