RectTransformLockPosition.cs

using UnityEngine;

[ExecuteInEditMode()]
public class RectTransformLockPosition : MonoBehaviour
{
    private RectTransform rectTransform;
    private Vector3 startPosition;

    protected void Awake()
    {
		rectTransform = GetComponent<RectTransform>();
        startPosition = transform.position;
    }
    
    private void LateUpdate()
    {
		if (startPosition != null) 
		{
			rectTransform.position = startPosition;
		}
    }
}