How do I fix the directional light so the 2 sides aren't black? This happens everytime I make a new project

When I make a new project in unity and place a cube, 1 side of it is completely black and one side is almost completely black. How do I fix this? And is there a way to fix is permanently so that when I create a new project it always is fixed?

Dont know about permanently fix it
But in light window u can set an ambient color/gradient so that the full dark face get some light
I think it is in environment panel of light window