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// create new style in themes.xml
<style name="ToolbarTheme" parent="@style/ThemeOverlay.AppCompat.ActionBar">
<!-- Customize color of navigation drawer icon and back arrow -->
<item name="colorControlNormal">@color/your_custom_color</item>
</style>
// set this style to the toolbar in the Xml of the activity
<androidx.appcompat.widget.Toolbar
app:title="Home"
app:theme="@style/ToolbarTheme" // this one
app:titleTextColor="@color/white"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="?attr/colorPrimary"
android:id="@+id/toolbar" />