launcher/app/src/main/res/layout/activity_firststartup.xml

<androidx.constraintlayout.widget.ConstraintLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:custom="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/activity_firststartup_container"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="?attr/colorPrimary"
    android:onClick="clickAnywhere"
    tools:context=".FirstStartupActivity">

    <com.google.android.material.appbar.AppBarLayout
        android:id="@+id/activity_firststartup_app_bar"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:visibility="invisible"
        custom:layout_constraintEnd_toEndOf="parent"
        custom:layout_constraintStart_toStartOf="parent"
        custom:layout_constraintTop_toTopOf="parent">

        <androidx.constraintlayout.widget.ConstraintLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent">

            <TextView
                android:id="@+id/activity_firststartup_heading"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:gravity="center"
                android:minHeight="?actionBarSize"
                android:padding="@dimen/appbar_padding"
                android:text="@string/tutorial_title"
                android:textAppearance="@style/TextAppearance.Widget.AppCompat.Toolbar.Title"
                custom:layout_constraintEnd_toEndOf="parent"
                custom:layout_constraintStart_toStartOf="parent"
                custom:layout_constraintTop_toTopOf="parent" />

            <com.finnmglas.launcher.extern.FontAwesome
                android:id="@+id/activity_firststartup_close"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginEnd="8dp"
                android:layout_marginRight="8dp"
                android:gravity="center"
                android:includeFontPadding="true"
                android:onClick="backToSettings"
                android:paddingLeft="16sp"
                android:paddingRight="16sp"
                android:text="@string/fa_close_window"
                android:textColor="?attr/colorAccent"
                android:textSize="22sp"
                custom:layout_constraintBottom_toBottomOf="parent"
                custom:layout_constraintEnd_toEndOf="parent"
                custom:layout_constraintTop_toTopOf="parent"
                custom:type="solid" />
        </androidx.constraintlayout.widget.ConstraintLayout>

    </com.google.android.material.appbar.AppBarLayout>

    <TextView
        android:id="@+id/activity_firststartup_section_heading"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:onClick="clickAnywhere"
        android:textSize="64sp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.100000024" />

    <TextView
        android:id="@+id/activity_firststartup_descriptive_text"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:layout_marginStart="32dp"
        android:layout_marginLeft="32dp"
        android:layout_marginEnd="32dp"
        android:layout_marginRight="32dp"
        android:layout_marginBottom="100dp"
        android:gravity="center"
        android:onClick="clickAnywhere"
        android:textColor="#fff"
        android:textSize="36sp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.6"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@id/activity_firststartup_section_heading" />

    <TextView
        android:id="@+id/activity_firststartup_hint_text"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:layout_marginStart="32dp"
        android:layout_marginLeft="32dp"
        android:layout_marginTop="8dp"
        android:layout_marginEnd="32dp"
        android:layout_marginRight="32dp"
        android:layout_marginBottom="8dp"
        android:gravity="center"
        android:onClick="clickAnywhere"
        android:textColor="#999"
        android:textSize="18sp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.6"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@id/activity_firststartup_descriptive_text" />

</androidx.constraintlayout.widget.ConstraintLayout>