How to Hide All-in-One WP Migration Admin Menus

function plt_hide_all_in_one_wp_migration_menus() {
	//Hide "All-in-One WP Migration".
	remove_menu_page('ai1wm_export');
	//Hide "All-in-One WP Migration → Export".
	remove_submenu_page('ai1wm_export', 'ai1wm_export');
	//Hide "All-in-One WP Migration → Import".
	remove_submenu_page('ai1wm_export', 'ai1wm_import');
	//Hide "All-in-One WP Migration → Backups 0".
	remove_submenu_page('ai1wm_export', 'ai1wm_backups');
	//Hide "All-in-One WP Migration → What's new".
	remove_submenu_page('ai1wm_export', 'ai1wm_whats_new');
}

add_action('admin_menu', 'plt_hide_all_in_one_wp_migration_menus', 11);

Where do I put this code?