If the display is HDR-10 capable and you want to use it directly instead using of VLC's tone-mapping, then you need to be running Windor higher, the GPU must support HDR-10 and you must use your video graphic adapter's DisplayPort 1.4 or HDMI 2.0 connection. Like your monitor it doesn't support real HDR or real wide color gamut.) (My monitor is HDR capable if I use its HDMI 2.0 connection in HDR mode but not if I use its HDMI 1.4 connection.
VLC uses tone mapping to simulate HDR if the display or the video graphic adapter's HDMI connection is not HDR capable. To check that VLC is set to use hardware decoding so it can play 4K HEVC smoothly, go to Tools->Preferences->Input/Codecs and make sure that Hardware accelerated decoding is set to "Automatic".
Note that the GPU must support HEVC hardware decoding or video playback will be too choppy to watch. I use VLC 3.0.7.1 Ventari to play UHD HDR-10 video.
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