tachiyomi/app/src/main/res/layout/source_header_item.xml

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="wrap_content">

    <TextView
        android:id="@+id/title"
        style="@style/TextAppearance.MaterialComponents.Caption"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:paddingTop="8dp"
        android:paddingBottom="8dp"
        android:paddingStart="12dp"
        tools:text="Title" />

</FrameLayout>