How to Hide Email OTP Authenticator Admin Menus

function plt_hide_email_otp_authenticator_menus() {
	//Hide "Email OTP Router".
	remove_menu_page('email-otp-authenticator');
	//Hide "Email OTP Router → Settings".
	remove_submenu_page('email-otp-authenticator', 'email-otp-authenticator');
	//Hide "Email OTP Router → Integration".
	remove_submenu_page('email-otp-authenticator', 'integrate-email-otp-authenticator');
	//Hide "Email OTP Router → Activity Log".
	remove_submenu_page('email-otp-authenticator', 'log-email-otp-authenticator');
	//Hide "Email OTP Router → Add Snippet".
	remove_submenu_page('email-otp-authenticator', 'snippets-email-otp-authenticator');
	//Hide "Email OTP Router → Switch Plugin".
	remove_submenu_page('email-otp-authenticator', 'switch-email-otp-authenticator');
	//Hide "Email OTP Router → Set-up Wizard".
	remove_submenu_page('email-otp-authenticator', 'setupwizard-email-otp-authenticator');
	//Hide "Email OTP Router → Official Website".
	remove_submenu_page('email-otp-authenticator', '#');
}

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

Where do I put this code?