AlertDialog does not expand to full width. What to do?

Question

Android

What to do?

Here is the Layout AlertDialog

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.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"
android:elevation="4dp">

<ScrollView
    android:id="@+id/scrollView2"
    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">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical">

        <TextView

            android:id="@+id/name"
            android:layout_width="333dp"
            android:layout_height="50dp"
            android:layout_marginStart="24dp"

            android:layout_marginTop="40dp"
            android:textColor="#000000"
            android:textSize="20pt"
            android:textStyle="bold" />

        <TextView
            android:id="@+id/description"
            android:layout_width="333dp"
            android:layout_height="172dp"
            android:layout_marginStart="24dp"

            android:layout_marginTop="20dp"

            android:layout_marginEnd="13dp"
            android:textSize="14pt" />

        <Button
            android:id="@+id/btnJoin"

            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginStart="161dp"
            android:layout_marginTop="86dp"
            android:layout_marginEnd="162dp"
            android:layout_marginBottom="272dp"
            android:text="@string/joint" />

    </LinearLayout>
</ScrollView>

<ImageButton
    android:id="@+id/closeBtn"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_gravity="right|end"
    android:layout_marginTop="8dp"
    android:layout_marginEnd="8dp"
    android:layout_marginBottom="8dp"
    android:adjustViewBounds="true"
    android:background="@drawable/ic_action_content_clear"
    android:cropToPadding="false"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintEnd_toEndOf="@+id/scrollView2"
    app:layout_constraintHorizontal_bias="1.0"
    app:layout_constraintStart_toStartOf="@+id/scrollView2"
    app:layout_constraintTop_toTopOf="@+id/scrollView2"
    app:layout_constraintVertical_bias="0.011"
    app:srcCompat="@drawable/ic_action_content_clear" />


</android.support.constraint.ConstraintLayout>

Answer 1

Set for ConstraintLayout
android:layout_width="wrap_content"