android:id="@+id/nav_upper"
android:layout_width="match_parent"
android:layout_height="wrap_content"
+ android:divider="@drawable/list_divider_inside_out"
android:orientation="vertical"
+ android:showDividers="beginning"
app:layout_constraintBottom_toTopOf="@+id/nav_fixed_items"
app:layout_constraintTop_toBottomOf="@+id/nav_header">