How to change android app launchMode?

Hi, I added two android plugins to my app on Unity: the google play services and the google admob plugin. They created the android manifest file and after that, when I click the app icon it restarts the app completely.

I know I need to change the launchMode. The problem is that I don't know which activity need to be changed. I tried adding launchMode="singleInstance" to all UnityPlayer activities on the manifest, but it still restarts.

Here's the manifest: http://schemas.android.com/apk/res/android" android:installLocation="preferExternal" package="com.example.admobtest" android:versionName="1.0" android:versionCode="1">

     <!-- Google Mobile Ads Permissions -->
     <uses-permission android:name="android.permission.INTERNET" />
     <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
     
     <application android:icon="@drawable/app_icon" android:label="@string/app_name" android:debuggable="false">
         
         <!-- meta-data tag for Google Play services -->
         <meta-data android:name="com.google.android.gms.version" android:value="@integer/google_play_services_version" />
         
         <activity android:name="com.unity3d.player.UnityPlayerProxyActivity" android:launchMode="singleInstance" android:label="@string/app_name" android:configChanges="fontScale|keyboard|keyboardHidden|locale|mnc|mcc|navigation|orientation|screenLayout|screenSize|smallestScreenSize|uiMode|touchscreen">
             <meta-data android:name="unityplayer.ForwardNativeEventsToDalvik" android:value="true" />
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />
                 <category android:name="android.intent.category.LAUNCHER" />
             </intent-filter>
         </activity>
         
         <activity android:name="com.unity3d.player.UnityPlayerActivity" android:launchMode="singleInstance" android:label="@string/app_name" android:configChanges="fontScale|keyboard|keyboardHidden|locale|mnc|mcc|navigation|orientation|screenLayout|screenSize|smallestScreenSize|uiMode|touchscreen">
         </activity>
         
         <activity android:name="com.unity3d.player.UnityPlayerNativeActivity" android:label="@string/app_name" android:configChanges="fontScale|keyboard|keyboardHidden|locale|mnc|mcc|navigation|orientation|screenLayout|screenSize|smallestScreenSize|uiMode|touchscreen">
             <meta-data android:name="unityplayer.ForwardNativeEventsToDalvik" android:value="true" />
             <meta-data android:name="android.app.lib_name" android:value="unity" />
         </activity>
         
         <activity android:name="com.unity3d.player.VideoPlayer" android:label="@string/app_name" android:configChanges="fontScale|keyboard|keyboardHidden|locale|mnc|mcc|navigation|orientation|screenLayout|screenSize|smallestScreenSize|uiMode|touchscreen">
         </activity>
         
         <!-- Google Mobile Ads Activity -->
         <activity android:name="com.google.android.gms.ads.AdActivity" android:label="@string/app_name" android:configChanges="fontScale|keyboard|keyboardHidden|locale|mnc|mcc|navigation|orientation|screenLayout|screenSize|smallestScreenSize|uiMode|touchscreen">
         </activity>
     </application>
     
     <uses-feature android:glEsVersion="0x00020000" />
     <uses-sdk android:minSdkVersion="9" android:targetSdkVersion="19" />
 </manifest>