How to customize overflow menu's width?

Question

I want to modify width of overflow menu. But I dont know how to access the overflow menu.

I tried to

How can I change popup item width size?

Reduce Menu items width,height and textview size

But I could not modify the width.

res/menu/custom_actionbar_item.xml

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto">
   <item
       android:id="@+id/action_search"
       android:title="@string/search"
       app:showAsAction="never"/>

   <item
       android:id="@+id/action_menu"
       android:title="@string/setting"
       app:showAsAction="never"/>
</menu>

java/source

@Override
public boolean onCreateOptionsMenu(Menu menu)
{
    getMenuInflater().inflate(R.menu.custom_actionbar_item, menu);

    return true;
}