Navigating from one textField to other programatically using FocusState is not working

My requirement is that, I have one textField, onpressing it one keyboard will appear. In keyboard, the nextButton is pressed it should go to next textfield without dismissing the textField.I have tried with FocusState, but it is not working

import SwiftUI
enum placeholder {
    case email
    case password
    var description: String {
        return  switch self {
                case .email: "email"
                case .password: "password"
                }
    }
    var nextControll: String {
        return  switch self {
                case .email: "password"
                case .password: "email"
                }
    }
    
}
struct customTextField: View {
    var placeHolder: placeholder = .email
    @State var description: String = ""
    @FocusState var focusstate: String?

    var body: some View {
        TextField(placeHolder.description, text: $description)
            .padding(.horizontal, 20)
            .frame(width: 300, height: 50)
            .background {
                RoundedRectangle(cornerRadius: 12)
                    .stroke(Color.gray, lineWidth: 2)
            }
            .focused($focusstate, equals: placeHolder.description)
            .onSubmit {
                focusstate = placeHolder.nextControll
            }
            .submitLabel(.next)
    }
}

struct TextFieldObservers: View {
    var placeholderView: placeholder?
    var body: some View {
        Group {
            customTextField(placeHolder: .email, description: "")
            customTextField(placeHolder: .password, description: "")
        }
        .padding(.horizontal, 30)
    }
}

#Preview {
    TextFieldObservers()
}

See reference link: https://www.reddit.com/r/SwiftUI/comments/xxvvo3/how_to_prevent_the_keyboard_hiding_after_i_click/?rdt=61416

Each of your customTextField's has own @FocusState, they don't share it with each other, your TextFieldObservers should have that focus state and text fields - receive it as a parameter. There are a lot of other options tow to organize it as well