How to Hide Merchant Admin Menus

function plt_hide_merchant_menus() {
	//Hide "Merchant".
	remove_menu_page('merchant');
	//Hide "Merchant → Dashboard".
	remove_submenu_page('merchant', 'merchant');
	//Hide "Merchant → Modules".
	remove_submenu_page('merchant', 'admin.php?page=merchant&section=modules');
	//Hide "Merchant → Settings".
	remove_submenu_page('merchant', 'admin.php?page=merchant&section=settings');
	//Hide "Merchant → Patcher".
	remove_submenu_page('merchant', 'athemes-patcher-preview-mp');
	//Hide "Merchant → Upgrade to Pro".
	remove_submenu_page('merchant', 'https://athemes.com/merchant-upgrade?utm_source=theme_submenu_page&utm_medium=button&utm_campaign=Merchant');
}

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

Where do I put this code?