Hi, @JohnTravolski I noticed the same behavior on 1903 build 18362.356 using dark theme. I fixed it by choosing "Flat white" in appearance style.
However it doesn't work for ALL folders. Strangely, in some folders (Documents, Downloads, Contacts) the details pane is white, which makes it un-readable... Did anyone experienced the same issue ?
A screenshot is visible here (my PC is in french) : https://imgur.com/a/1svE8ww