Problem in Navigation Menu

I have a problem with the Navigation menu, I added pages under a home page so how can I get these pages under the home page on navbar.

using System.Linq;
using System.Threading.Tasks; 
using CMS.Websites; 
using Kentico.Content.Web.Mvc.Routing; 
using Microsoft.IdentityModel.Tokens;

namespace Kickstart.Web.Features.Navigation;

public class NavigationService : INavigationService
{
    private readonly IWebPageUrlRetriever webPageUrlRetriever;
    private readonly IPreferredLanguageRetriever preferredLanguageRetriever;

    public NavigationService(IWebPageUrlRetriever webPageUrlRetriever,
    IPreferredLanguageRetriever preferredLanguageRetriever)
    {
        this.webPageUrlRetriever = webPageUrlRetriever;
        this.preferredLanguageRetriever = preferredLanguageRetriever;
    }

    public async Task<NavigationItemViewModel> GetNavigationItemViewModel(NavigationItem navigationItem)
    {
        if (navigationItem?.NavigationItemTarget?.IsNullOrEmpty() ?? true)
        {
            return null;
        }

        var targetGuid = navigationItem.NavigationItemTarget.FirstOrDefault().WebPageGuid;

        var targetUrl = await webPageUrlRetriever.Retrieve(targetGuid, preferredLanguageRetriever.Get());

        return new NavigationItemViewModel
        {
            Title = navigationItem.NavigationItemTitle,
            Url = targetUrl.RelativePath
        };
    }

    public async Task<NavigationMenuViewModel> GetNavigationMenuViewModel(NavigationMenu navigationMenu)
    {
        if (navigationMenu?.NavigationMenuItems?.IsNullOrEmpty() ?? true)
        {
            return null;
        }

        var menuItems = await Task.WhenAll(navigationMenu.NavigationMenuItems.Select(GetNavigationItemViewModel));

        return new NavigationMenuViewModel
        {
            Name = navigationMenu.NavigationMenuDisplayName,
            Items = menuItems
        };
    }
}
















using System.Linq;
using System.Threading.Tasks;

using CMS.ContentEngine;
using CMS.Websites.Routing;

using Kentico.Content.Web.Mvc.Routing;

using Microsoft.AspNetCore.Mvc;

namespace Kickstart.Web.Features.Navigation;
public class NavigationMenuViewComponent : ViewComponent
{
    private readonly IContentQueryExecutor contentQueryExecutor;
    private readonly IPreferredLanguageRetriever preferredLanguageRetriever;
    private readonly IWebsiteChannelContext webSiteChannelContext;
    private readonly INavigationService navigationService;

    public NavigationMenuViewComponent(
        IContentQueryExecutor contentQueryExecutor,
        IPreferredLanguageRetriever preferredLanguageRetriever,
        IWebsiteChannelContext webSiteChannelContext,
        INavigationService navigationService)
    {
        this.contentQueryExecutor = contentQueryExecutor;
        this.preferredLanguageRetriever = preferredLanguageRetriever;
        this.webSiteChannelContext = webSiteChannelContext;
        this.navigationService = navigationService;
    }

    public async Task<IViewComponentResult> InvokeAsync(string navigationMenuCodeName)
    {
        var menu = await RetrieveMenu(navigationMenuCodeName);

        if (menu == null)
        {
            return View("/Features/Navigation/NavigationMenuViewComponent.cshtml", new NavigationMenuViewModel());
        }

        var model = await navigationService.GetNavigationMenuViewModel(menu);

        return View("/Features/Navigation/NavigationMenuViewComponent.cshtml", model);
    }

    private async Task<NavigationMenu> RetrieveMenu(string navigationMenuCodeName)
    {
        var builder = new ContentItemQueryBuilder()
            .ForContentType(NavigationMenu.CONTENT_TYPE_NAME,
            config => config
                .Where(where => where.WhereEquals(nameof(NavigationMenu.NavigationMenuCodeName), navigationMenuCodeName))
                .WithLinkedItems(2))
            .InLanguage(preferredLanguageRetriever.Get());

        var queryExecutorOptions = new ContentQueryExecutionOptions
        {
            ForPreview = webSiteChannelContext.IsPreview
        };

        var items = await contentQueryExecutor.GetMappedResult<NavigationMenu>(builder, queryExecutorOptions);

        return items.FirstOrDefault();
    }
}










//--------------------------------------------------------------------------------------------------
// <auto-generated>
//
//     This code was generated by code generator tool.
//
//     To customize the code use your own partial class. For more info about how to use and customize
//     the generated code see the documentation at https://docs.xperience.io/.
//
// </auto-generated>
//--------------------------------------------------------------------------------------------------

using System;
using System.Collections.Generic;
using CMS.ContentEngine;

namespace Kickstart
{
	/// <summary>
	/// Represents a content item of type <see cref="NavigationMenu"/>.
	/// </summary>
	[RegisterContentTypeMapping(CONTENT_TYPE_NAME)]
	public partial class NavigationMenu : IContentItemFieldsSource
	{
		/// <summary>
		/// Code name of the content type.
		/// </summary>
		public const string CONTENT_TYPE_NAME = "Kickstart.NavigationMenu";


		/// <summary>
		/// Represents system properties for a content item.
		/// </summary>
		[SystemField]
		public ContentItemFields SystemFields { get; set; }


		/// <summary>
		/// NavigationMenuDisplayName.
		/// </summary>
		public string NavigationMenuDisplayName { get; set; }


		/// <summary>
		/// NavigationMenuCodeName.
		/// </summary>
		public string NavigationMenuCodeName { get; set; }


		/// <summary>
		/// NavigationMenuItems.
		/// </summary>
		public IEnumerable<NavigationItem> NavigationMenuItems { get; set; }
	}
}









//--------------------------------------------------------------------------------------------------
// <auto-generated>
//
//     This code was generated by code generator tool.
//
//     To customize the code use your own partial class. For more info about how to use and customize
//     the generated code see the documentation at https://docs.xperience.io/.
//
// </auto-generated>
//--------------------------------------------------------------------------------------------------

using System;
using System.Collections.Generic;
using CMS.ContentEngine;
using CMS.Websites;

namespace Kickstart
{
	/// <summary>
	/// Represents a content item of type <see cref="NavigationItem"/>.
	/// </summary>
	[RegisterContentTypeMapping(CONTENT_TYPE_NAME)]
	public partial class NavigationItem : IContentItemFieldsSource
	{
		/// <summary>
		/// Code name of the content type.
		/// </summary>
		public const string CONTENT_TYPE_NAME = "Kickstart.NavigationItem";


		/// <summary>
		/// Represents system properties for a content item.
		/// </summary>
		[SystemField]
		public ContentItemFields SystemFields { get; set; }


		/// <summary>
		/// NavigationItemTitle.
		/// </summary>
		public string NavigationItemTitle { get; set; }


		/// <summary>
		/// NavigationItemTarget.
		/// </summary>
		public IEnumerable<WebPageRelatedItem> NavigationItemTarget { get; set; }
	}
}