View Controller not visible in Identity Inspector

I am trying to learn Xcode using iOS 14 Programming for Beginners.
I have just created a new View Controller and created a Cocoa Touch class called RestaurantListViewController. In this I had to add 2 collection view stubs and an @IBoutlet var to the UICollectionView.
The book then instructs me to click on th View Controller in the
document outline, for the view controller I have just created, the click on the Identity Inspector to add the class, but it says no selection?
I can't see where I am going wrong?
The only warning I get is: Prototype collection view cells must have reuse indentifiers.
Here is the code for the class:

Code Block 
//
//  RestaurantListViewController.swift
//  EatOut
//
//  Created by Tony Hudson on 22/05/2021.
//
import UIKit
class RestaurantListViewController: UIViewController, UICollectionViewDataSource, UICollectionViewDelegate {
    @IBOutlet weak var collectionView: UICollectionView!
    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view.
    }
    func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
        1
    }
    func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
       return collectionView.dequeueReusableCell(withReuseIdentifier: "restaurantCell", for: indexPath)
    }
}

Please can someone help?