How to edit defualt widget navigation input?

Does anyone know of a way to edit the default input settings for widget navigation.

I’ve got my vertical box full of buttons, and I want to navigate through them using ONLY the arrow keys, not the tab key or game-pad or anything else.
I know how to do this if I had made my own navigation, but if there is a way to just change the default engine widget navigation input settings somewhere, that would be a huge time saver.

I went into Engine/Source/Runtime/Slate/Public/Framework/Application/Navigationconfig in visual studio and changed things there, but it had no effect when I tested it out.

If anyone knows how do do this, it would be great if you could help me out!