in asp.net core, whether possible for the endpoint to process new requests before old requests completed?

I test concurrency like this: Open 2 tabs in Chrome and visit localhost:5006/test almost simultaneously.
I want to achieve that I send 2 requests almost simultaneously and then getting 2 responses almost simultaneously 10 seconds later, but in reality I send 2 requests almost simultaneously and get the first response 10 seconds later, and then get the second response another 10 seconds

I have tried using asynchronous endpoint but it doesn't work.
Here is my code.

Program.cs

var builder = WebApplication.CreateBuilder(args);
builder.Services.AddControllers();
var app = builder.Build();
app.MapControllers();
app.Run();

TestController.cs

using Microsoft.AspNetCore.Mvc;

namespace Test.Controllers;

[ApiController]
[Route("/test")]
public class TestController : ControllerBase
{
    public async Task<IActionResult> Echo()
    {
        Console.WriteLine("new requests come");
        await Task.Delay(10000); //Time-consuming operations
        return Ok("Hello");
    }
}

launchSettings.json

{
  "$schema": "https://json.schemastore.org/launchsettings.json",
  "iisSettings": {
    "windowsAuthentication": false,
    "anonymousAuthentication": true,
    "iisExpress": {
      "applicationUrl": "http://localhost:62699",
      "sslPort": 44389
    }
  },
  "profiles": {
    "Test": {
      "commandName": "Project",
      "dotnetRunMessages": true,
      "launchBrowser": false,
      "launchUrl": "swagger",
      "applicationUrl": "http://localhost:5006",
      "environmentVariables": {
        "ASPNETCORE_ENVIRONMENT": "Development"
      }
    },
    "IIS Express": {
      "commandName": "IISExpress",
      "launchBrowser": true,
      "launchUrl": "swagger",
      "environmentVariables": {
        "ASPNETCORE_ENVIRONMENT": "Development"
      }
    }
  }
}