Hello,
On TV dark theme, the bid line color setting has no effect. I think the same bug also exists on TV light theme, but I didn't test it exclusively.
Above is my chart settings.
The ask line is red as it should be and it changes color immediately when I change the color in the chart settings.
The bid line, however, does not change color and I noticed that its color depends on the current bar's color (body I think), so in my case a get a darker line with a bearish bar as seen in the screenshot (pointed at with the purple arrow).
In this screenshot, which was taken 1 bar later, you can see that the bid line's color has changed to match the bull bar.
Bid line's color should not change depending on current bar, just like the ask line.
Thanks.