How do I remove the default post type from the admin toolbar

You need to hook to 3 different action hooks to fully hide the default post type. However, a direct access to the default post by URL is still possible. So, let’s get started.

The Side Menu

add_action( 'admin_menu', 'remove_default_post_type' );

function remove_default_post_type() {
    remove_menu_page( 'edit.php' );
}

The + New > Post link in Admin Bar

add_action( 'admin_bar_menu', 'remove_default_post_type_menu_bar', 999 );

function remove_default_post_type_menu_bar( $wp_admin_bar ) {
    $wp_admin_bar->remove_node( 'new-post' );
}

The + New link in Admin Bar

function remove_add_new_post_href_in_admin_bar() {
    ?>
    <script type="text/javascript">
        function remove_add_new_post_href_in_admin_bar() {
            var add_new = document.getElementById('wp-admin-bar-new-content');
            if(!add_new) return;
            var add_new_a = add_new.getElementsByTagName('a')[0];
            if(add_new_a) add_new_a.setAttribute('href','#!');
        }
        remove_add_new_post_href_in_admin_bar();
    </script>
    <?php
}
add_action( 'admin_footer', 'remove_add_new_post_href_in_admin_bar' );


function remove_frontend_post_href(){
    if( is_user_logged_in() ) {
        add_action( 'wp_footer', 'remove_add_new_post_href_in_admin_bar' );
    }
}
add_action( 'init', 'remove_frontend_post_href' );

The Quick Draft Dashboard Widget

add_action( 'wp_dashboard_setup', 'remove_draft_widget', 999 );

function remove_draft_widget(){
    remove_meta_box( 'dashboard_quick_press', 'dashboard', 'side' );
}