How to change the direction of gravity

Hi Everybody,
For some reason in all of my scenes even when i open a new one, the axis of gravity is the -Z axis. Shouldn’t this be the -Y axis? The only reason this matters is when i try to make a scene “sideways” to use gravity, theres no Num pad key for the relative top. :o

If I underst\and correctly what you mean then:

Rotate all your scene’s objects so the gravity and direction is the one you need. the Z axis is the vertical axis so its normal gravity is going down that line?

What? I thought It’s the same as a paper 2D Graph but with z as the 3rd axis to make it 3D

No, the grid is actually the ground.

OK then
Thanks