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using UnityEngine;
public class HideCanvasWhenCloseToCamera : MonoBehaviour
{
    public float hideWhenCloserThan = 3f; // Set in inspector.
    
    private Transform cameraTransform;
    private Canvas canvas;
    
    void Awake() 
    {
         cameraTransform = Camera.main.transform; // Assumes scene has camera tagged MainCamera.
         canvas = GetComponent<Canvas>(); // Assumes this GO has a Canvas.
     }
    
    void Update()
    {
        var distance = Vector3.Distance(this.transform.position, cameraTransform.position);
        canvas.enabled = distance > hideWhenCloserThan;
    }
}