Hi,
I’m not 100% sure on what you mean then. You mention directional light so do you mean that you can change the parameters in the UI, but they will not actually do anything to the game itself in the viewport? If so may be because overrides the directional light in some ways so some directional light settings would be ignored if they were changed (e.g. light colour).
Or do you mean that you physically can’t change the values (perhaps they’re greyed out?).
A screenshot would help if that’s possible.
Thanks