RidgeScout/app/src/main/res/layout/fragment_transfer.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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="match_parent"
    tools:context=".ui.transfer.TransferFragment">

    <TextView
        android:id="@+id/no_event_error"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="No event has been specified\nPlease select one"
        android:textAlignment="center"
        android:textSize="20sp"
        android:visibility="gone"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <androidx.constraintlayout.widget.ConstraintLayout
        android:id="@+id/main_select_layout"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent">

        <Button
            android:id="@+id/uploadButton"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Upload"
            android:textSize="34sp"
            app:layout_constraintBottom_toTopOf="@+id/downloadButton"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="parent" />

        <Button
            android:id="@+id/CSVButton"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="CSV"
            android:textSize="34sp"
            app:layout_constraintBottom_toTopOf="@+id/downloadButton"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@+id/uploadButton" />

        <Button
            android:id="@+id/downloadButton"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Download"
            android:textSize="34sp"
            app:layout_constraintBottom_toBottomOf="@+id/TBAButton"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@+id/uploadButton" />

        <Button
            android:id="@+id/TBAButton"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="TBA"
            android:textSize="34sp"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@+id/downloadButton" />

    </androidx.constraintlayout.widget.ConstraintLayout>

</androidx.constraintlayout.widget.ConstraintLayout>