Android - Button at the end of ScrollView not visible - android-studio

Question

I have added a button at the end of a ScrollView layout, inside it is a Constraint Layout. Both are inside a Relative layout. However, upon scrolling, the button does not show up on my device. It's stuck at the bottom of the layout and cannot get up. I have tried everything.
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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=".activities.BachelorDetailActivity"
android:id="#+id/layout_fragment_studyplan">
<ScrollView
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
android:clipToPadding="false"
android:fillViewport="true">
<androidx.constraintlayout.widget.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<TextView
android:id="#+id/h1_studyplan"
android:textSize="#dimen/h1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/title_studyplan"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintStart_toStartOf="parent"
android:textColor="#color/color_primary"
android:textStyle="bold"
android:textAllCaps="true"
android:paddingTop="#dimen/margin_default"
android:paddingStart="#dimen/margin_default"/>
<TextView
android:id="#+id/p_studyplan"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:layout_constraintTop_toBottomOf="#id/h1_studyplan"
app:layout_constraintStart_toStartOf="parent"
android:text="#string/list_studyplan"
android:paddingBottom="#dimen/margin_huge"
android:paddingStart="#dimen/margin_default"
android:paddingTop="#dimen/margin_default"
android:singleLine="false"
android:lineSpacingExtra="#dimen/margin_short"/>
<Button
android:id="#+id/btn_contact_study"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toBottomOf="#id/p_studyplan"
android:layout_width="wrap_content"
android:layout_height="#dimen/button"
android:layout_marginBottom="500dp"
android:text="#string/contact_guide"
android:textColor="#color/white"
android:backgroundTint="#color/color_primary"/>
</androidx.constraintlayout.widget.ConstraintLayout>
</ScrollView>
</RelativeLayout>

Answer 1

If you are trying to get the button to slide up the screen by 500dp by setting android:layout_marginBottom="500dp" as the button's bottom margin, you will also need to specify a bottom constraint for the button.
app:layout_constraintBottom_toBottomOf="parent"
Margins apply only when there is a constraint in effect for the direction of the margin.