Signal-Android/app/src/main/res/layout/expire_timer_settings_fragment.xml

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

    <include
        layout="@layout/dsl_settings_fragment"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

    <org.thoughtcrime.securesms.util.views.CircularProgressMaterialButton
        android:id="@+id/timer_select_fragment_save"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="bottom|end"
        android:layout_marginEnd="16dp"
        android:layout_marginBottom="16dp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:circularProgressMaterialButton__label="@string/ExpireTimerSettingsFragment__save" />

</FrameLayout>