Essa parte encontra-se na Activity_menu.xml
<android.support.v7.widget.Toolbar
android:id="@+id/menu_barra"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="?attr/colorAccent"
android:elevation="4dp"
app:theme="@style/Theme.AppCompat.Light"
tools:ignore="MissingConstraints"
tools:targetApi="lollipop" />