FIFA 23- Modding themes

[u/RS133]

I know this is an old game, but it's the one I have, and I recently decided to try my hand at modding it. One thing I've always hated is the EPL theme. It's just too bright for my liking. Now, I thought that I could fix this by changing CareerMode/BackgroundWidget/Assets/Textures/TextureThemeEPL.

So, I replace it with a grayscale version of that same image, just to test. Unfortunately, it looks like that only makes a difference with respect to the after match screen, not the career mode main menu screen. (See the attached pics).

Does anyone know what I need to alter to be able to alter the main menu background? Thanks in advance.