This works, but it breaks because it assumes the drag event was instigated by the mouse. For reference, here is the component I wrote:

 using UnityEngine;
 using UnityEngine.UI;
 
 [RequireComponent(typeof(RectTransform))]
 public class PanelDragBehavior : MonoBehaviour
 {
     private RectTransform rect;
 
     public void Awake()
     {
         rect = GetComponent<RectTransform>();
     }
 
     public void OnDrag(UnityEngine.EventSystems.BaseEventData eventData)
     {
         var pointerData = eventData as UnityEngine.EventSystems.PointerEventData;
         if (pointerData == null) { return; }
 
 
         var currentPosition = rect.position;
         currentPosition.x += pointerData.delta.x;
         currentPosition.y += pointerData.delta.y;
         rect.position = currentPosition;
     }
 }

Simply you can use LeanTouch Lean Dragabble UI script. It available for free in unity store.