Why is the toolbar not displaying correctly?

Question

Java

Why is the toolbar not displaying correctly? With what it can be connected?

<?xml version="1.0" encoding="utf-8"?>


<LinearLayout
        xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:app="http://schemas.android.com/apk/res-auto"
        xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical">


    <android.support.design.widget.AppBarLayout
            android:layout_height="wrap_content"
            android:layout_width="match_parent"
            android:theme="@style/AppTheme.AppBarOverlay">

        <android.support.v7.widget.Toolbar
                android:id="@+id/toolbar"
                android:layout_width="match_parent"
                android:layout_height="?attr/actionBarSize"
                android:background="?attr/colorPrimary"
                app:popupTheme="@style/AppTheme.PopupOverlay"/>

    </android.support.design.widget.AppBarLayout>
    <android.support.v4.widget.DrawerLayout
            android:id="@+id/drawer_layout"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:fitsSystemWindows="true"
            tools:openDrawer="start"
            >

        <include
                layout="@layout/app_bar_ana_seyfe"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:layout_weight="1"/>
        <include layout="@layout/activity_home" android:layout_weight="1"
                     tools:ignore="IncludeLayoutParam" android:layout_width="match_parent"/>
        <android.support.design.widget.NavigationView
                android:id="@+id/nav_view"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:layout_gravity="start"
                android:fitsSystemWindows="true"
                app:headerLayout="@layout/nav_header_ana_seyfe"
                app:menu="@menu/activity_ana_seyfe_drawer"
                android:layout_weight="1">
        </android.support.design.widget.NavigationView>

    </android.support.v4.widget.DrawerLayout>

</LinearLayout>