title: Many-To-Many Fields View on Django Admin
body: <p>Basically I am trying to recreate a fields in this model that is similar to django user authenticate system, for this I try using many-to-many fields but it ended up like this.</p>
  
  <p><img src="https://i.stack.imgur.com/ge4pu.png" alt="enter image description here"></p>
  
  <p>I am trying to have another field that can show what exist and another field for I have chosen similar to django admin, which looks like this.</p>
  
  <p><img src="https://i.stack.imgur.com/wblTH.png" alt="enter image description here"></p>
  
  <p>This is my code</p>
  
  <pre><code>class Category(models.Model):
      name = models.CharField(max_length=128, unique=True)
  
  class BlogPage(models.Model):
      category = models.ManyToManyField(Category)
      title = models.CharField(max_length=128)
      preview = models.TextField(max_length=256)
      content = models.TextField()
  </code></pre>