How to Hide EMC - Easily Embed Calendly Scheduling Admin Menus

function plt_hide_embed_calendly_scheduling_menus() {
	//Hide "EMC".
	remove_menu_page('emcs-event-types');
	//Hide "EMC → Event Types".
	remove_submenu_page('emcs-event-types', 'emcs-event-types');
	//Hide "EMC → Customizer".
	remove_submenu_page('emcs-event-types', 'emcs-customizer');
	//Hide "EMC → Settings".
	remove_submenu_page('emcs-event-types', 'emcs-settings');
	//Hide "EMC → Booking Growth Tools".
	remove_submenu_page('emcs-event-types', 'emcs-licenses');
}

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

Where do I put this code?