How to Hide RTM Mail | WP Mail Logger Admin Menus

function plt_hide_rtm_mail_wp_mail_logger_menus() {
	//Hide "WP Mail Logger".
	remove_menu_page('rtm-mail-dashboard');
	//Hide "WP Mail Logger → Dashboard".
	remove_submenu_page('rtm-mail-dashboard', 'rtm-mail-dashboard');
	//Hide "WP Mail Logger → Overview".
	remove_submenu_page('rtm-mail-dashboard', 'rtm-mail-overview');
	//Hide "WP Mail Logger → Settings".
	remove_submenu_page('rtm-mail-dashboard', 'rtm-mail-settings');
	//Hide "WP Mail Logger → Mail SMTP".
	remove_submenu_page('rtm-mail-dashboard', 'rtm-mail-mailsmtp');
	//Hide "WP Mail Logger → Debug Events".
	remove_submenu_page('rtm-mail-dashboard', 'rtm-mail-events');
}

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

Where do I put this code?