I think it would be a good idea to be able to change the display color of the chart histogram. The difference with the background color is so subtle that it can be hard to see depending of screen and surrounding light conditions and both in the light theme and the dark theme.
If you use the “volume profile” indicator provided in the “free indicator” section, there you can customize the color, true, but this volume profile stays on top of the market depth (in case you are displaying it in the chart) in such a way that it is almost impossible to see the latter. It could also be a nice option that this indicator could stay BEHIND the market depth display.
Thanks