current/support/wear/res/values-v24/values-v24.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <style name="Widget.Wear.RoundSwitch" parent="@android:style/Widget.Material.CompoundButton.Switch">
        <item name="android:layout_width">@dimen/ws_switch_size</item>
        <item name="android:layout_height">@dimen/ws_switch_size</item>
        <item name="android:switchMinWidth">@dimen/ws_switch_size</item>
        <item name="android:layout_gravity">center</item>
        <item name="android:thumb">@drawable/ws_switch_thumb_material_anim</item>
        <item name="android:thumbTint">@color/ws_switch_thumb_color_material</item>
        <item name="android:thumbTintMode">multiply</item>
        <item name="android:track">@drawable/ws_switch_track_mtrl</item>
        <item name="android:trackTint">@color/ws_switch_track_color_material</item>
        <item name="android:background">@empty</item>
        <item name="android:showText">false</item>
    </style>
</resources>