Is there a way to change the editors appearance?

I like UE4, but to be honest, it looks like a children’s toy.
Big round buttons, way too much color. It just looks … childish.

Is there any way to change that?
Are there editor styles I seemed to miss?
Is there any way to change the overall appearance to a slim flat or almost flat design?

Kind regards,
NineSun

yes, open the engine, go to Edit>EditorPreferences>GeneralAppearance