Please change your layout as below. Used LinearLayout with property android:orientation="vertical" instead of FrameLayout.

<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"     xmlns:tools="http://schemas.android.com/tools"     android:layout_width="match_parent"     android:layout_height="match_parent"     tools:context=".Fragment.SearchFragment"     android:orientation="vertical">      <com.google.android.material.appbar.AppBarLayout         android:layout_width="match_parent"         android:layout_height="wrap_content"         android:id="@+id/bar"         android:background="?android:attr/windowBackground">          <androidx.appcompat.widget.Toolbar             android:layout_width="match_parent"             android:layout_height="wrap_content"             android:background="?android:attr/windowBackground"             android:id="@+id/toolbar">              <ImageView                 android:layout_width="wrap_content"                 android:layout_height="wrap_content"                 android:src="@drawable/ic_search_light"                 android:layout_marginRight="10dp"/>              <EditText                 android:layout_width="match_parent"                 android:layout_height="wrap_content"                 android:id="@+id/search_bar"                 android:background="@android:color/transparent"                 android:hint="Search..."                 android:layout_marginStart="10dp"                 android:layout_marginLeft="10dp"/>          </androidx.appcompat.widget.Toolbar>     </com.google.android.material.appbar.AppBarLayout>      <androidx.recyclerview.widget.RecyclerView         android:layout_width="match_parent"         android:layout_height="wrap_content"         android:id="@+id/recycler_view" />  </LinearLayout> 

Layout_Below exists in the relativeLayout , if you want to get access to that , you may need to switch to RelativeLayout or Alternativaly use linear layout if you want to put views one under the other by setting the orientation to vertical .

This is not correct. A RecyclerView should never go underneath an AppBarLayout. What you should do is ensure that there is sufficient margin between the RecyclerView and the AppbarLayout

you need the layout like ConstraintLayout, RelativeLayout and LinearLayout.

example:

ConstraintLayout :

   <?xml version="1.0" encoding="utf-8"?> <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"     xmlns:tools="http://schemas.android.com/tools"     android:layout_width="match_parent"     android:layout_height="match_parent"     xmlns:app="http://schemas.android.com/apk/res-auto">     <androidx.constraintlayout.widget.ConstraintLayout         android:layout_width="match_parent"         android:layout_height="match_parent">       <com.google.android.material.appbar.AppBarLayout         android:layout_width="match_parent"         android:layout_height="wrap_content"         android:id="@+id/bar"         android:background="?android:attr/windowBackground">          <androidx.appcompat.widget.Toolbar             android:layout_width="match_parent"             android:layout_height="wrap_content"             android:background="?android:attr/windowBackground"             android:id="@+id/toolbar">              <ImageView                 android:layout_width="wrap_content"                 android:layout_height="wrap_content"                 android:src="@drawable/ic_search_light"                 android:layout_marginRight="10dp"/>              <EditText                 android:layout_width="match_parent"                 android:layout_height="wrap_content"                 android:id="@+id/search_bar"                 android:background="@android:color/transparent"                 android:hint="Search..."                 android:layout_marginStart="10dp"                 android:layout_marginLeft="10dp"/>          </androidx.appcompat.widget.Toolbar>     </com.google.android.material.appbar.AppBarLayout>      <androidx.recyclerview.widget.RecyclerView         app:layout_constraintTop_toBottomOf="@id/bar"         android:layout_width="match_parent"         android:layout_height="wrap_content"         android:id="@+id/recycler_view" />       </androidx.constraintlayout.widget.ConstraintLayout>  </FrameLayout> 

RelativeLayout :

 <?xml version="1.0" encoding="utf-8"?> <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"     xmlns:tools="http://schemas.android.com/tools"     android:layout_width="match_parent"     android:layout_height="match_parent"     xmlns:app="http://schemas.android.com/apk/res-auto">     <RelativeLayout         android:layout_width="match_parent"         android:layout_height="match_parent">       <com.google.android.material.appbar.AppBarLayout         android:layout_width="match_parent"         android:layout_height="wrap_content"         android:id="@+id/bar"         android:background="?android:attr/windowBackground">          <androidx.appcompat.widget.Toolbar             android:layout_width="match_parent"             android:layout_height="wrap_content"             android:background="?android:attr/windowBackground"             android:id="@+id/toolbar">              <ImageView                 android:layout_width="wrap_content"                 android:layout_height="wrap_content"                 android:src="@drawable/ic_search_light"                 android:layout_marginRight="10dp"/>              <EditText                 android:layout_width="match_parent"                 android:layout_height="wrap_content"                 android:id="@+id/search_bar"                 android:background="@android:color/transparent"                 android:hint="Search..."                 android:layout_marginStart="10dp"                 android:layout_marginLeft="10dp"/>          </androidx.appcompat.widget.Toolbar>     </com.google.android.material.appbar.AppBarLayout>      <androidx.recyclerview.widget.RecyclerView         android:layout_below="@id/bar"         android:layout_width="match_parent"         android:layout_height="wrap_content"         android:id="@+id/recycler_view" />       </RelativeLayout> 

LinearLayout:

 <?xml version="1.0" encoding="utf-8"?> <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"     xmlns:tools="http://schemas.android.com/tools"     android:layout_width="match_parent"     android:layout_height="match_parent"     xmlns:app="http://schemas.android.com/apk/res-auto">     <LinearLayout         android:orientation="vertical"         android:layout_width="match_parent"         android:layout_height="match_parent">       <com.google.android.material.appbar.AppBarLayout         android:layout_width="match_parent"         android:layout_height="wrap_content"         android:id="@+id/bar"         android:background="?android:attr/windowBackground">          <androidx.appcompat.widget.Toolbar             android:layout_width="match_parent"             android:layout_height="wrap_content"             android:background="?android:attr/windowBackground"             android:id="@+id/toolbar">              <ImageView                 android:layout_width="wrap_content"                 android:layout_height="wrap_content"                 android:src="@drawable/ic_search_light"                 android:layout_marginRight="10dp"/>              <EditText                 android:layout_width="match_parent"                 android:layout_height="wrap_content"                 android:id="@+id/search_bar"                 android:background="@android:color/transparent"                 android:hint="Search..."                 android:layout_marginStart="10dp"                 android:layout_marginLeft="10dp"/>          </androidx.appcompat.widget.Toolbar>     </com.google.android.material.appbar.AppBarLayout>      <androidx.recyclerview.widget.RecyclerView          android:layout_width="match_parent"         android:layout_height="wrap_content"         android:id="@+id/recycler_view" />       </LinearLayout>            </FrameLayout>