includeAppBar.axml

<?xml version="1.0" encoding="utf-8"?>
<com.google.android.material.appbar.AppBarLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@+id/appBarLayout"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    style="?attr/appBarLayoutStyle">

    <LinearLayout
        android:id="@+id/toolbarWrapLayout"
        android:orientation="vertical"
        android:layout_width="match_parent"
        android:layout_height="wrap_content">

        <com.google.android.material.appbar.MaterialToolbar
            style="Widget.Material3.Toolbar"
            android:minHeight="?android:attr/actionBarSize"
            android:layout_height="wrap_content"
            android:layout_width="match_parent"
            android:id="@+id/toolbar"/>

        <com.google.android.material.progressindicator.LinearProgressIndicator
            android:id="@+id/appBarProgressIndicator"
            android:indeterminate="true"
            android:visibility="invisible"
            app:trackThickness="2dp"
            app:trackColor="@android:color/transparent"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"/>
    </LinearLayout>

</com.google.android.material.appbar.AppBarLayout>