This question has been asked a number of times, but I cannot seem to hide the 3 dots icon.
There is no action_settings menu item in menu_main.xml, and yet the settings icon appears none the less. 
I can't hide it in onPrepareOptionsMenu because there is no id for the icon
@Override
public boolean onPrepareOptionsMenu(Menu menu) {
    MenuItem item= menu.findItem(R.id.menu_settings);
    item.setVisible(false);
    super.onPrepareOptionsMenu(menu);
    return true;
}
My main activity lay out begins:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
    <include
        android:id="@+id/toolbar_actionbar"
        layout="@layout/toolbar_default"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />
    <android.support.v4.widget.DrawerLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:id="@+id/drawer_layout"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_below="@+id/toolbar_actionbar">
        <LinearLayout
        ....
and layout toolbar_default is
<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.Toolbar xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:appcompat="http://schemas.android.com/apk/res-auto"
    style="@style/ToolBarStyle"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:background="?attr/colorPrimary"
    android:minHeight="@dimen/abc_action_bar_default_height_material"/>
and menu_main.xml is
<menu xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:appcompat="http://schemas.android.com/apk/res-auto">
    <item
        android:id="@+id/menu_search"
        android:title="@string/menu_search"
        appcompat:actionViewClass="android.support.v7.widget.SearchView"
        appcompat:showAsAction="always"/>
</menu>
and ToolBarStyle
<style name="ToolBarStyle" parent="">
    <item name="popupTheme">@style/ThemeOverlay.AppCompat</item>
    <item name="theme">@style/ThemeOverlay.AppCompat.Dark.ActionBar</item>
</style>
<style name="CustomPrefTheme" parent="Theme.AppCompat.NoActionBar">
    <item name="android:checkboxStyle">@style/AppTheme.Preference.Checkbox</item>
</style>
 
     
    