Oh wait I assumed it was a blueprint access issue but reading your original post once again, now I see that you’re actually trying to edit an inherited component.
I couldn’t connect that to your objective though. Could you expand on the steps you took to get there? Maybe I’m misunderstanding something but to adjust the camera transform to your liking from the viewport, you just gotta create a new C++ based character class, add the camera component to it the way I explained, and play with the positioning either by changing the defaults or changing during runtime.