Use rounded back arrow for settings actionbar.

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

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<vector xmlns:android="http://schemas.android.com/apk/res/android"

        android:width="24dp"

        android:height="24dp"

        android:viewportWidth="24.0"

        android:viewportHeight="24.0"

        android:autoMirrored="true"

        android:tint="?attr/colorControlNormal">

    <path

        android:fillColor="@color/white"

        android:pathData="M20,11H7.62l4.88,-4.88a0.996,0.996 0,1 0,-1.41 -1.41l-6.94,6.94c-0.2,0.2 -0.2,0.51 0,0.71l6.94,6.94a0.996,0.996 0,1 0,1.41 -1.41L7.62,13H20c0.55,0 1,-0.45 1,-1s-0.45,-1 -1,-1z"/>

</vector>

    <!-- Default theme for Settings and activities launched from Settings. -->

    <style name="Theme.Material.Settings" parent="Theme.Material.Light.LightStatusBar">

        <item name="homeAsUpIndicator">@drawable/ic_ab_back_material_settings</item>

        <item name="colorPrimary">@color/primary_material_settings_light</item>

        <item name="colorPrimaryDark">@color/primary_dark_material_settings_light</item>

        <item name="colorSecondary">@color/secondary_material_settings_light</item>