Please can you help me to change constraints in code to take an elements like in the second screen.

We'll constrain the "main image view" 12-points from the top, 40-points from each side, and give it a 5:3 ratio.

Then we'll add a UIStackView (with 12-point spacing) below it, constrained 12-points from the bottom of the main image view, 75% of the width, centered horizontally.

Each image view that we add to the stack view will be constrained to a 1:2 ratio (square).

Here's sample code to do that:

class DetailsHomeViewController: UIViewController {
    
    var images:[String] = ["label", "label", "label"]
    
    let mainImageView: UIImageView = {
        let theImageView = UIImageView()
        theImageView.contentMode = .scaleAspectFill
        theImageView.clipsToBounds = true
        theImageView.layer.cornerRadius = 24.0
        return theImageView
    }()
    
    override func viewDidLoad() {
        super.viewDidLoad()

        view.backgroundColor = #colorLiteral(red: 1, green: 1, blue: 1, alpha: 1)

        setupViews()

        mysetupViews()
    }
    
    
    private func setupViews() {
        
        // a stack view to hold the "thumbnail" image views
        let stackView = UIStackView()
        stackView.spacing = 12
        
        mainImageView.translatesAutoresizingMaskIntoConstraints = false
        stackView.translatesAutoresizingMaskIntoConstraints = false
        
        view.addSubview(mainImageView)
        view.addSubview(stackView)

        // respect the safe area
        let g = view.safeAreaLayoutGuide

        NSLayoutConstraint.activate([

            // main image view - let's go with
            //  Top with 12-points "padding"
            mainImageView.topAnchor.constraint(equalTo: g.topAnchor, constant: 12.0),
            //  Leading and Trailing with 40-points "padding"
            mainImageView.leadingAnchor.constraint(equalTo: g.leadingAnchor, constant: 40.0),
            mainImageView.trailingAnchor.constraint(equalTo: g.trailingAnchor, constant: -40.0),
            // height equal to width x 3/5ths (5:3 aspect ratio)
            mainImageView.heightAnchor.constraint(equalTo: mainImageView.widthAnchor, multiplier: 3.0 / 5.0),

            // stack view
            //  Top 12-points from main image view Bottom
            stackView.topAnchor.constraint(equalTo: mainImageView.bottomAnchor, constant: 12.0),
            //  width equal to 75% of the main image view width
            stackView.widthAnchor.constraint(equalTo: mainImageView.widthAnchor, multiplier: 0.75),
            //  centered horizontally
            stackView.centerXAnchor.constraint(equalTo: mainImageView.centerXAnchor),

        ])

        // make sure we can load the main image
        if let img = UIImage(named: images[0]) {
            mainImageView.image = img
        }

        // now we'll add 3 image views to the stack view
        images.forEach { imgName in
            let thumbView = UIImageView()
            thumbView.contentMode = .scaleAspectFill
            thumbView.clipsToBounds = true
            thumbView.layer.cornerRadius = 16.0
            // we want them to be square
            thumbView.heightAnchor.constraint(equalTo: thumbView.widthAnchor).isActive = true
            // make sure we can load the image
            if let img = UIImage(named: imgName) {
                thumbView.image = img
            }
            stackView.addArrangedSubview(thumbView)
        }
        
    }
    
    private func mysetupViews() {
        createCustomNavigationBar()
        
        let RightButton = createCustomButton(
            imageName: "square.and.arrow.up",
            selector: #selector(RightButtonTapped)
        )
        
        let customTitleView = createCustomTitleView(
            detailsName: "Label"
        )
        
        navigationItem.rightBarButtonItems = [RightButton]
        navigationItem.titleView = customTitleView
    }
    
    @objc private func RightButtonTapped() {
        print("RightButtonTapped")
    }
    
}