Check out example codes for "unity how to make a ui disappear". It will help you in understanding the concepts better.

Code Example 1

using UnityEngine;
using UnityEngine.UI;

public class ScriptName : MonoBehaviour
    private CanvasGroup Canvas;

	// makes canvas invisible
    void Awake()
        Canvas.alpha = 0f;
        Canvas.interactable = false;
        Canvas.blocksRaycasts = false;

	// when button is clicked canvas becomes visible
    public void Click()
        Canvas.alpha = 1f;
        Canvas.interactable = true;
        Canvas.blocksRaycasts = true;

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