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I see, the label is out of the box.
Usually candles on most platforms are filled inside regardless of type.
Like so
For dark theme, hollow green is not good enough, especially when user zoom in the charts, I have plan to add a filled theme too.
In MetaTrader 4 one can change the candlestick however he likes, maybe you should add something like that?
Also I wrote a filled version for comparing hollow and filled theme, finally I used hollow version and hide the filled version.
Replace hollow theme is not possible as I expressed before. Add new theme, it will be an useless option for most of people. So the filled theme still won't be added currently.