Problem moving a panel UI

Hi,

Sorry I'm too stupid to find an answer. I searched on forums and tutorial videos and can't find the solution.

I have a UI Panel with UI children: menus and game UI.

What I want to do: push a button and automatically so the camera pans to a position of this panel. I want to have different positions (different menus)

The problem: I can't find out the right size of the panel (or screen) so if I want to interpolate the camera between positions always sets out of position

Canvas: Screen Space Camera • Plane distance : 10 • Canvas Scaler: Scale with Screen Size • Ref. Resolution: 160 x 220 • Match: Width • Ref units: 100 •

 void Start ()
     {
         float co = Screen.height; //canvas.GetComponent<RectTransform> ().rect.height * canvas.scaleFactor;
 
         Vector3 n = Camera.main.ScreenToWorldPoint (new Vector3 (canvas.GetComponent<RectTransform> ().rect.width * canvas.scaleFactor, co, canvas.planeDistance));
         heightHUD = n.y;
         print ("CO " + co);
 
     }

My coroutine (triggered when a button is pushed) :

         while (true) {
 
             yield return new WaitForSeconds (1f);
             SlotpParent.SetActive (false);
 
             float movement = Mathf.Lerp (HUD.transform.position.y, heightHUD * 3, (Time.time - startTime) / overTime);
 
             Vector2 pos = new Vector2 (transform.position.x, movement);
             HUD.transform.position = pos;
 
             if (HUD.transform.position.y >= heightHUD * 3) {
                 StopCoroutine ("BringMap");
 
             }
             yield return null;
         }
         yield return null;
     }