How to Hide WP Simple Booking Calendar Admin Menus

function plt_hide_wp_simple_booking_calendar_menus() {
	//Hide "WP Simple Booking Calendar".
	remove_menu_page('wp-simple-booking-calendar');
	//Hide "WP Simple Booking Calendar → Calendars".
	remove_submenu_page('wp-simple-booking-calendar', 'wpsbc-calendars');
	//Hide "WP Simple Booking Calendar → Settings".
	remove_submenu_page('wp-simple-booking-calendar', 'wpsbc-settings');
	//Hide "WP Simple Booking Calendar → Backup/Restore".
	remove_submenu_page('wp-simple-booking-calendar', 'wpsbc-backup');
}

add_action('admin_menu', 'plt_hide_wp_simple_booking_calendar_menus', 12);

Where do I put this code?