Version: 2017.3

ScrollRect.horizontalNormalizedPosition

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public float horizontalNormalizedPosition ;

Description

The horizontal scroll position as a value between 0 and 1, with 0 being at the left.

using UnityEngine;
using System.Collections;
using UnityEngine.UI;  // Required when Using UI elements.

public class ExampleClass : MonoBehaviour { public ScrollRect myScrollRect; public Scrollbar newScrollBar;

public void Start() { //Change the current horizontal scroll position. myScrollRect.horizontalNormalizedPosition = 0.5f; } }