Label color does not fill icons

When label color is used in icons, only the lower part of the icon is colored. Is there a way to fill it?

I’m not seeing in your screenshot what you’re describing. I see a series of icons, completely colored either red, yellow, orange, purple, or blue. Although upon close examination, it appears the color is a gradient, but it took me a moment to be able to tell that the color fades as you go up; it still registers to my eye as top-to-bottom coloring–is that what you mean?

Yes, the color is a gradient, that’s what I meant. It shows even more on other icons. I’d like to have a solid color patch.