title: How can I edit the header in a blank activity?
body: <p>I'm very new to android studio but I can't see any XML of the header, so I can't edit it. I want to do things like change it's position, height etc so is there any way I can do this?</p>
  
  <p>activity_main.xml</p>
  
  <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
  &lt;android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
      xmlns:app="http://schemas.android.com/apk/res-auto"
      xmlns:tools="http://schemas.android.com/tools"
      android:layout_width="match_parent"
      android:layout_height="match_parent"
  
      tools:context="com.example.zorgan.app.MainActivity"
      tools:layout_editor_absoluteY="81dp"
      tools:layout_editor_absoluteX="0dp"&gt;
  
  
  &lt;/android.support.constraint.ConstraintLayout&gt;
  </code></pre>