Not sure if this addresses what you're trying to accomplish at this point, but if I were trying to get all of those lines to be the same color I'd try this ...
Select the entire image as shown, then change the associated line style either (a) to a different color of choice while keeping the Style 1 association, or (b) changing the selected line art to a different style (clicking on another style while the artwork is selected with the selection tool) and go from there.
As noted above, using the default (alpha) style 0 and/or (black) style 1 can limit future editing possibilities once the project becomes more complicated. Whenever I forget to load a project style palette I've created and managed as I progress in a project, I wind up regretting it later ;-)