This is a countinuation of "Form embedded in a NavigationView" code snippet. This screen contains now 4 different Sections, each with a different component.

Conditional Show or Hide components.swift

import SwiftUI

struct ContentView: View {

    @State private var pickerSelectedIndex = 0
    @State private var toggleOn = false
    @State private var textFieldValue = ""
    var treats = Treat.demoTreats

    var body: some View {
    
    // Navigation
        NavigationView {
        
            //Form to collect data
            Form {
            
                // Section with Picker presented in a different window
                Section {
                    Picker(selection: $pickerSelectedIndex, label: Text("Treats")) {
                        ForEach(0 ..< self.treats.count) {
                            Text(self.treats[$0].name).tag($0)
                        }
                    }
                }
                
                // Section with Toggle (in the same window)
                Section {
                    Toggle(isOn: $toggleOn) {
                        Text("Would you like to add some milk? ")
                    }

                    if toggleOn {
                        Text("Milk costs extra 0.99 Eur")
                    }
                }
                
                // Section with TextField
                Section {
                    TextField("Insert your comments here", text: $textFieldValue)
                }
                
                // Section with Button
                Section {
                    Button(action: {
                        print("Your order is being processed ..")
                    }) {
                        HStack(alignment: .center, spacing: 10) {
                            Image(systemName: "paperplane")
                                .foregroundColor(.green)
                                .scaledToFit()

                            Text("Confirm order")
                                .foregroundColor(.green)

                        }
                    }
                }

            }.navigationBarTitle(Text("Treats for your cat"))
        }
    }
}