Differences Between Fujifilm's Dynamic Range Setting and HDR Mode
FUJIFILM Dynamic range DR400 in RAW??!! This feature might change your photography! - YouTube
Little bit of nerdiness. I found that the DR400 setting in video results in more red and saturated image and less natural colors. Details in comments : r/fujifilm
Fujifilm X-H1 Video Autofocus Issue at DR400 - Fuji Rumors