zombie_mp/Assets/Scripts/Menu/infinityUI.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class infinityUI : MonoBehaviour
{
    public float speed;
    public RectTransform panel;
    public Vector2 curPosition;
    public Vector2 curSize;

    private void Start()
    {
        panel.SetSizeWithCurrentAnchors(RectTransform.Axis.Horizontal, Screen.width * 2);
    }
    public float curX;
    void FixedUpdate()
    {
        curX += Time.deltaTime * speed;
        curPosition = panel.localPosition;
        curSize = panel.sizeDelta;

        if(curX >= Screen.width) { curX = 0; }
        panel.anchoredPosition = new Vector2(-curX, 0);
    }
}