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">

    <com.google.android.material.textfield.TextInputLayout
        android:id="@+id/outlinedTextField"
        style="@style/Widget.MaterialComponents.TextInputLayout.OutlinedBox"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_margin="20dp"
        app:hintEnabled="false"
        app:boxCornerRadiusBottomEnd="20dp"
        app:boxCornerRadiusBottomStart="20dp"
        app:boxCornerRadiusTopEnd="20dp"
        app:boxCornerRadiusTopStart="20dp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent">

        <AutoCompleteTextView
            android:id="@+id/autoCompleteTextView"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:hint="Search"
            android:imeOptions="actionSearch"
            android:inputType="text"
            android:maxLines="1"
            android:padding="12dp" />

    </com.google.android.material.textfield.TextInputLayout>

    <!--    <com.google.android.material.textfield.MaterialAutoCompleteTextView-->
    <!--        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_margin="10dp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/outlinedTextField"
        />

</androidx.constraintlayout.widget.ConstraintLayout>