Mercury-IM/app/src/main/res/layout/view_fingerprints_card_toggleable.xml

<?xml version="1.0" encoding="utf-8"?>
<com.google.android.material.card.MaterialCardView
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    app:cardCornerRadius="4dp"
    app:cardElevation="4dp">

    <androidx.constraintlayout.widget.ConstraintLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical"
        android:paddingStart="12dp"
        android:paddingEnd="12dp"
        android:paddingTop="12dp"
        android:paddingBottom="12dp">

        <TextView
            android:id="@+id/title"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Other Fingerprints"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="parent"  />

        <androidx.recyclerview.widget.RecyclerView
            android:id="@+id/fingerprint_list"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            tools:listitem="@layout/view_openpgp_4_fingerprint_toggleable"
            android:layout_centerHorizontal="true"
            android:layout_marginTop="8dp"
            app:layoutManager="androidx.recyclerview.widget.LinearLayoutManager"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintHorizontal_bias="0.5"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@+id/title"/>

    </androidx.constraintlayout.widget.ConstraintLayout>

</com.google.android.material.card.MaterialCardView>