title: Action bar showing two action bar
body: <p>My <code>ActionBar</code> is not working properly . See this: 
  <a href="https://i.stack.imgur.com/Y9vXR.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/Y9vXR.png" alt="enter image description here"></a></p>
  
  <p><code>AndroidManifest.xml</code> code is here: </p>
  
  <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
  &lt;manifest xmlns:android="http://schemas.android.com/apk/res/android"
      package="com.abc.xyz"&gt;
  
      &lt;application
          android:allowBackup="true"
          android:icon="@mipmap/ic_launcher"
          android:label="@string/app_name"
          android:supportsRtl="true"
          android:theme="@style/AppTheme"&gt;
          &lt;activity
              android:name=".MainActivity"
              android:label="@string/app_name"
              android:screenOrientation="portrait"
              android:theme="@style/AppTheme"&gt;
              &lt;intent-filter&gt;
                  &lt;action android:name="android.intent.action.MAIN" /&gt;
                  &lt;category android:name="android.intent.category.LAUNCHER" /&gt;
              &lt;/intent-filter&gt;
          &lt;/activity&gt;
          &lt;activity
              android:name=".AddActivity"
              android:label="@string/title_activity_add"
              android:theme="@style/AppTheme" /&gt;
      &lt;/application&gt;
  
  &lt;/manifest&gt;
  </code></pre>
  
  <p>How to remove the lower action bar which is not displaying activity name ?</p>