if you are creating your own collider in a baker you do something like
var material = PhysMaterial.Default;
material.CollisionResponse = CollisionResponsePolicy.RaiseTriggerEvents;
var blob = Unity.Physics.BoxCollider.Create(new BoxGeometry
{
BevelRadius = 0.05f,
Center = bounds.center,
Orientation = quaternion.identity,
Size = bounds.size,
}, filter, material);
var physicsCollider = new PhysicsCollider { Value = blob };
if you are using the sample authoring or unity gameobject collider components to set things, you can change it from a baking system
CapsuleCollider* capsuleCollider = (CapsuleCollider*)enemyCollider.ColliderPtr;
var enemyMaterial = capsuleCollider->Material;
enemyMaterial.CollisionResponse = CollisionResponsePolicy.None;
capsuleCollider->Material = enemyMaterial;