How to hold a beautiful beam?

Question

Unity

Previously, I already asked how to make a laser beam, rummaged through various examples, I couldn’t really figure it out.
Here's what I have at the moment - there is a gun that has a tower (initial coordinate), there is an enemy (end coordinate), I have these two coordinates calculated normally, and that I build a beam like this

spoiler

void Start(){
  towerHead = transform.Find("Head");
  GameObject lineObj = new GameObject("LineObj");
  lineRenderer = lineObj.AddComponent<LineRenderer>();
  }
  
void Update(){
  lineRenderer.SetPosition(0,towerHead.transform.position);
  lineRenderer.SetPosition(1,enemy.transform.position);
  .............

That is, a default lineRenderer is created and drawn from the tower to the target, and it turns out not a ray, but some kind of pink rectangle, how to set it up?
I tried to create a line element and make a prebuff out of it, but when using it, it is not visible at all, and there are no bends, as if it is invisible ...
I still can’t understand how it works and I can’t find sensible examples where it would be clearly explained what and how. ..