So I noticed that when "Widget Glances" is disabled (so the widgets take up the whole screen) the screens inside a widget (like VO2 Max, Training load, steps of last 7 days,...) have a white background.
But when I enable widget glances, all the white backgrounds become black so it's just like a dark theme. Is it possible to give us an option in the watch settings to switch manually between a light and dark theme without having to enable widget glances? It wouldn't be that hard I think. Here you can see what I mean:
Widget Glances enabled ("dark theme"):
Widget Glances disabled ("white theme"):