WordPress/src/main/res/layout/preference_category.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:paddingLeft="@dimen/margin_extra_large"
    android:paddingRight="@dimen/margin_extra_large"
    android:paddingTop="@dimen/margin_extra_large">

    <org.wordpress.android.widgets.WPTextView
        android:id="@+android:id/title"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textColor="@color/grey_darken_10"
        android:textSize="@dimen/text_sz_medium"
        android:textStyle="bold"
        android:fontFamily="sans-serif-light" />

</LinearLayout>