How to Hide Better Notifications for WP Admin Menus

function plt_hide_bnfw_menus() {
	//Hide "Notifications".
	remove_menu_page('edit.php?post_type=bnfw_notification');
	//Hide "Notifications → All Notifications".
	remove_submenu_page('edit.php?post_type=bnfw_notification', 'edit.php?post_type=bnfw_notification');
	//Hide "Notifications → Add New Notification".
	remove_submenu_page('edit.php?post_type=bnfw_notification', 'post-new.php?post_type=bnfw_notification');
	//Hide "Notifications → Settings".
	remove_submenu_page('edit.php?post_type=bnfw_notification', 'bnfw-settings');
	//Hide "Notifications → Add-on Licenses".
	remove_submenu_page('edit.php?post_type=bnfw_notification', 'bnfw-license');
	//Hide "Notifications → Documentation".
	remove_submenu_page('edit.php?post_type=bnfw_notification', 'https://betternotificationsforwp.com/documentation/');
	//Hide "Notifications → Premium Add-ons".
	remove_submenu_page('edit.php?post_type=bnfw_notification', 'https://betternotificationsforwp.com/downloads/');
	//Hide "Notifications → Priority Support".
	remove_submenu_page('edit.php?post_type=bnfw_notification', 'https://betternotificationsforwp.com/priority-support/');
}

add_action('admin_menu', 'plt_hide_bnfw_menus', 13);
Where do I put this code?