Fixed showing last opened tab on back pressed

app/src/main/AndroidManifest.xml

@@ -20,7 +20,8 @@
 
         <activity
             android:name=".MainActivity"
-            android:label="@string/app_name">
+            android:label="@string/app_name"
+            android:launchMode="singleTop">
             <intent-filter>
                 <action android:name="android.intent.action.MAIN"/>
                 <category android:name="android.intent.category.LAUNCHER"/>