Why the entire foreign table is showing in swagger schema?

Question

I'm new to .Net. I simply created two tables using the below queries.

CREATE TABLE Users(
Id int  PRIMARY KEY NOT NULL identity(1,1),
Name varchar(50),
Email varchar(50) //Users Table
)



CREATE TABLE Cities(
Id int primary key not null identity(1,1),
City varchar(45),
Country varchar(45),
UserId int,
FOREIGN KEY(UserId) REFERENCES Users(Id) //Cities Table
)

This is a post method I created to Add a user to the db.

public async Task<IActionResult> AddUser([FromBody]User data)
        {
            try {
                var user = new User
                {
                    Name = data.Name,
                    Email = data.Email,
                };

                await dbContext.Users.AddAsync(user);
                await dbContext.SaveChangesAsync();

                return Ok(new {message= "User has been added" });
                    }
            catch(Exception ex)
            {
                return BadRequest(ex);
            }
        }

My main question is. Why it is showing the Cities table in schema in Swagger ?

Class definition for Users. i have removed the imports since they arent necessary

namespace CRUDRevision.Models
{
    public partial class User
    {
        public User()
        {
            Cities = new HashSet<City>();
        }

        public int Id { get; set; }
        public string? Name { get; set; }
        public string? Email { get; set; }

        public virtual ICollection<City> Cities { get; set; }
    }
}

Class Definition for Cities

namespace CRUDRevision.Models
{
    public partial class City
    {
        public int Id { get; set; }
        public string? City1 { get; set; }
        public string? Country { get; set; }
        public int? UserId { get; set; }

        public virtual User? User { get; set; }
    }
}

Looking forward for a complete answer