Change the colors in the Graph Editor community this is my first question in the forum. Of course, I have been trying to find the answer for quite some time before posting, and nope, the setting I am looking for is not in the THEME tab from the settings menu in Blender.
By the way, I am using Blender 2.82a, and the problem is that I have a light blue color that interferes with the white letters in the graph editor's transform channels and it's hard to read(I have noticed most likely everyone has dark gray background), Please take look to the image.
In the view menu of the graph editor, uncheck "show group colors", and the default color should be back.

This light blue color you see is associated to the bone groups in the armature properties. It is very handy in the viewport, but make things less readable in the graph editor.