public void ConfigureServices(IServiceCollection services)
{
    services.AddControllersWithViews();
    services.AddRazorPages();
    services.AddDbContext<ProductDbContext>
    (opts =>
    {
        opts.UseSqlServer(Configuration["ConnectionStrings:AppDataConnection"]);
    });
    services.AddHttpsRedirection(opts =>
    {
        opts.HttpsPort = 44350;

    });      
    services.Configure<RazorViewEngineOptions>(opts=> {
        opts.PageViewLocationFormats.Clear();

       opts.PageViewLocationFormats.Add("/Pages/Shared/Layouts/{0}"     +  RazorViewEngine.ViewExtension);              
    });
}

I am configuring the RazorViewEngineOptions in the ConfigureServices method in Startup to add additional entries to the PageViewLocationFormats collection.

The program still searches only the default locations.

I cleared the list PageViewLocationFormats list

opts.PageViewLocationFormats.Clear();

but the program still searches only the default locations and shows error:

An unhandled exception occurred while processing the request.
InvalidOperationException: The layout view ‘_Layout’ could not be located. The following locations were searched:

/Views/Home/_Layout.cshtml
/Views/Shared/_Layout.cshtml
/Pages/Shared/_Layout.cshtml

Why is this not working? I am sure I did the same thing in previous versions and it used to work…