Color accent of the message list in the dark mode

dear all

K9 is a superior email client, however, I noticed that in dark mode, when you look at the read messages, the color is quite dim. Outdoor is very difficult to read. Unread messages are bright enough, but read ones are not.
I"m sending a screenshot from Aqua Email showing the difference, where it is much easier to read also on the sun
do you have any trick or workaround?

Thank you


here is the screenshot from K9: