I want you to set hdr to the original value yourself. You should turn on "Display hdr as original value" in FCPX preferences, so that you can view the correctly exposed material in the preview window, and the playback will also display HDR as original value. The method of using FCPX 10.4 to process HDR(HLG) materials to restore normal exposure value: Step 1, cover all the materials in the material library, select the information in the upper right corner, select settings, and then cover the color space. Here, you can choose REC709 and REC2020, and choose the overlay according to the previously shot color space. Another method is to manually adjust the highlight and saturation using the color wheel and swatches.