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Accessing Settings > Game Mode then HDR Effect in the settings menu for the LG 27'' UltraGear 4K UHD Nano IPS 1ms 144Hz G-Sync Compatible Gaming Monitor, Model # 27GN950-B as you have mentioned is how you enable HDR for the monitor. However, HDR content may not display correctly depending on Windows 10 OS settings, please check HDR on/off settings in Windows. You will need to contact Google about the settings for the YouTube HDR Video not showing the "gear" Settings Quality the "HDR" tag after the 4k resolution. That is not controlled by the monitor. You also need to check that the Graphics Card in your PC/Laptop also supports HDR...^IFV
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