How to Hide WPvivid Backup Plugin Admin Menus

function plt_hide_wpvivid_backuprestore_menus() {
	//Hide "WPvivid Backup".
	remove_menu_page('WPvivid');
	//Hide "WPvivid Backup → Backup & Restore".
	remove_submenu_page('WPvivid', 'WPvivid');
	//Hide "WPvivid Backup → Export & Import".
	remove_submenu_page('WPvivid', 'wpvivid-export-import');
	//Hide "WPvivid Backup → Image Cleaner (Beta)".
	remove_submenu_page('WPvivid', 'wpvivid-cleaner');
	//Hide "WPvivid Backup → Settings".
	remove_submenu_page('WPvivid', 'wpvivid-setting');
}

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

Where do I put this code?