I add this color grid texture and turn off the light for layer and object but the texture still effect by light from the world in all mode why?
I turned it off from the layers and from the object settings.like this
I just tested in 4.3. I added a default Suzanne Monkey head and changed nothing, then changed the world color. I saw a subtle shift, then did the above solution and it corrected it in all modes. I've not been able to replicate this issue - perhaps ask the developers and submit a bug report? See if they notice or have any advice? Here is the link: https://projects.blender.org/blender/blender/wiki/Module:%20Grease%20Pencil
I'm not sure what problem you're having. The layer isn't being affected by lights. If you're talking about the faded texture(UV Grid) that is because you have a strength of 0.6 and a blend of 0.524. If you set blend to 0 and strength to 1 you get just the texture colors.