Changing Paintbrush Color

I’d like to change some blue line drawings to black. It seems like this would be simple, to select the lines then change the color-- but I don’t seem to be able to guess. Can you select all and universally change the color?

If you select a stroke and press a new color swath the color of the stroke will change to the new swatch color. This also function for two or many brushstrokes. In Pro there is also a Select By Color tool that will select all brushstrokes of that color in the drawing layer… You find it under the Select Tool, just hold and you can choose between Select, Select By Color and Cutter Best regards Ivar