How to Customize IdentityServer views in Blazor?

[ghost]

I Have Project with Blazor Web assembly and Asp.Net Core Hosted with Individual user account (Authentication).
but I have two problems. First I want Customization Register and log in View (relate to identity server 4), but I can't find views. in the server project (blazor server) in _LoginPartial.cshtml view, we can see many pages: asp-area="Identity" asp-page="/Account/Manage/Index" andasp-area="Identity" asp-page="/Account/Logout" , asp-area="Identity" asp-page="/Account/Register" and so on ... but Identity folder is empty ! also in blazor client we have LoginDisplay.razor page :

<NotAuthorized>
    <a href="authentication/register">Register</a>
    <a href="authentication/login">Log in</a>
</NotAuthorized>

and in Pages folder we have Authentication.razor Component :

@page "/authentication/{action}"
@using Microsoft.AspNetCore.Components.WebAssembly.Authentication
<RemoteAuthenticatorView Action="@Action" />

@code{
    [Parameter] public string Action { get; set; }
}

Authentication.razor Component calling IdentityServer4 indirectly.

How can I find identity server 4 views and change it?

and the second problem is when I want to use a custom identity models in startup file blazor server.

default code is :

services.AddDefaultIdentity<ApplicationUser>(options => options.SignIn.RequireConfirmedAccount = true)
				.AddEntityFrameworkStores<ApplicationDbContext>();

and when i change to:

services.AddIdentity<ApplicationUser,Role>(options => options.SignIn.RequireConfirmedAccount = true)
                .AddEntityFrameworkStores<ApplicationDbContext>();

when I run project and click on login or register buttons (Authentication.razor) call IdentityServer (ex:https://localhost:5001/Identity/Account/Register?returnUrl=%2Fauthentication%2Flogin), take me an error :

Sorry, there's nothing at this address.

and I don't no why.

[ghost]

In Server project, Add New Scaffolded Item dialog, select Identity > Add.