LibreTube/app/src/main/res/layout/fragment_search.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=".SearchFragment">

    <AutoCompleteTextView
        android:id="@+id/autoCompleteTextView"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginTop="7dp"
        android:hint="@string/search_hint"
        android:imeOptions="actionSearch"
        android:inputType="text"
        android:maxLines="1"
        android:minHeight="48dp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />


    <androidx.recyclerview.widget.RecyclerView
        android:id="@+id/search_recycler"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:layout_marginTop="8dp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/autoCompleteTextView" />

</androidx.constraintlayout.widget.ConstraintLayout>