tachiyomi/app/src/main/res/menu/extension_main.xml

<menu xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto">
    <item
        android:id="@+id/action_filter"
        android:title="@string/filter"
        android:icon="@drawable/ic_filter_list_white_24dp"
        app:showAsAction="always"/>

    <item
        android:id="@+id/action_search"
        android:icon="@drawable/ic_search_white_24dp"
        android:title="@string/search"
        app:actionViewClass="androidx.appcompat.widget.SearchView"
        app:showAsAction="collapseActionView|ifRoom" />

    <item
        android:id="@+id/action_auto_check"
        android:title="@string/notify_extension_updates"
        android:icon="@drawable/ic_sync_black_24dp"
        android:visible="false"
        android:checkable="true"
        app:showAsAction="never"/>
</menu>