function plt_hide_dashboard_notepad_dashboard_widgets() {
$screen = get_current_screen();
if ( !$screen ) {
return;
}
//Remove the "Notepad" widget.
remove_meta_box('dashboard_notepad_widget_id', 'dashboard', 'normal');
}
add_action('wp_dashboard_setup', 'plt_hide_dashboard_notepad_dashboard_widgets', 20);