Are Rigidbody Automaticaly Heavier the bigger you make it?

Godot Version

4.2

Question

Does changing the size of the collision shape effect the rigidbody mass?

No,

if mass stays the same and size or volume increases. In physics, density is decreased. But Godot doesn’t simulate density so when size is changed nothing else is effected.

You can add more collision shapes and this should change the center mass.