Tips on Customizing RSVPMaker

How to Hide RSVPMaker Admin Menus

function plt_hide_rsvpmaker_menus() {
	//Hide "Settings → RSVPMaker".
	remove_submenu_page('options-general.php', 'rsvpmaker-admin.php');

	//Hide "RSVP Events".
	remove_menu_page('edit.php?post_type=rsvpmaker');
	//Hide "RSVP Events → RSVP Events".
	remove_submenu_page('edit.php?post_type=rsvpmaker', 'edit.php?post_type=rsvpmaker');
	//Hide "RSVP Events → Add New".
	remove_submenu_page('edit.php?post_type=rsvpmaker', 'post-new.php?post_type=rsvpmaker');
	//Hide "RSVP Events → Tags".
	remove_submenu_page('edit.php?post_type=rsvpmaker', 'edit-tags.php?taxonomy=post_tag&post_type=rsvpmaker');
	//Hide "RSVP Events → Event Type".
	remove_submenu_page('edit.php?post_type=rsvpmaker', 'edit-tags.php?taxonomy=rsvpmaker-type&post_type=rsvpmaker');
	//Hide "RSVP Events → Event Templates".
	remove_submenu_page('edit.php?post_type=rsvpmaker', 'edit.php?post_type=rsvpmaker_template');
	//Hide "RSVP Events → Create / Update".
	remove_submenu_page('edit.php?post_type=rsvpmaker', 'rsvpmaker_template_list');
	//Hide "RSVP Events → Event Setup".
	remove_submenu_page('edit.php?post_type=rsvpmaker', 'rsvpmaker_setup');
	//Hide "RSVP Events → Multiple Events (without a template)".
	remove_submenu_page('edit.php?post_type=rsvpmaker', 'rsvpmaker_setup&quick=5');
	//Hide "RSVP Events → Event Options".
	remove_submenu_page('edit.php?post_type=rsvpmaker', 'rsvpmaker_details');
	//Hide "RSVP Events → Confirmation / Reminders".
	remove_submenu_page('edit.php?post_type=rsvpmaker', 'rsvp_reminders');
	//Hide "RSVP Events → RSVP Report".
	remove_submenu_page('edit.php?post_type=rsvpmaker', 'rsvp_report');
	//Hide "RSVP Events → RSVPMaker Payments".
	remove_submenu_page('edit.php?post_type=rsvpmaker', 'rsvpmaker_stripe_report');

	//Hide "RSVP Mailer".
	remove_menu_page('edit.php?post_type=rsvpemail');
	//Hide "RSVP Mailer → RSVP Mailer".
	remove_submenu_page('edit.php?post_type=rsvpemail', 'edit.php?post_type=rsvpemail');
	//Hide "RSVP Mailer → Add New".
	remove_submenu_page('edit.php?post_type=rsvpemail', 'post-new.php?post_type=rsvpemail');
	//Hide "RSVP Mailer → Content for Email".
	remove_submenu_page('edit.php?post_type=rsvpemail', 'email_get_content');
	//Hide "RSVP Mailer → RSVPMaker Email List".
	remove_submenu_page('edit.php?post_type=rsvpemail', 'rsvpmaker_guest_list');
	//Hide "RSVP Mailer → Unsubscribed List".
	remove_submenu_page('edit.php?post_type=rsvpemail', 'unsubscribed_list');
	//Hide "RSVP Mailer → Email Design Templates".
	remove_submenu_page('edit.php?post_type=rsvpemail', 'rsvpmaker_email_template');
	//Hide "RSVP Mailer → Notification Templates".
	remove_submenu_page('edit.php?post_type=rsvpemail', 'rsvpmaker_notification_templates');
	//Hide "RSVP Mailer → Scheduled Email".
	remove_submenu_page('edit.php?post_type=rsvpemail', 'rsvpmaker_scheduled_email_list');
	//Hide "RSVP Mailer → Extract Addresses".
	remove_submenu_page('edit.php?post_type=rsvpemail', 'rsvpmaker_extract_email');
	//Hide "RSVP Mailer → Group Email".
	remove_submenu_page('edit.php?post_type=rsvpemail', 'rsvpmaker_relay_manual_test');
	//Hide "RSVP Mailer → Group Email Log".
	remove_submenu_page('edit.php?post_type=rsvpemail', 'rsvpmaker_relay_queue_monitor');

	//Hide "Tools → Import/Export RSVPMaker".
	remove_submenu_page('tools.php', 'rsvpmaker_export_screen');
	//Hide "Tools → Cleanup RSVPMaker".
	remove_submenu_page('tools.php', 'rsvpmaker_cleanup');
}

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

Where do I put this code?

How to Hide the "Hide The Menu on This Page" Meta Box

function plt_hide_rsvpmaker_metaboxes() {
	$screen = get_current_screen();
	if ( !$screen ) {
		return;
	}

	//Hide the "Hide The Menu on This Page" meta box.
	remove_meta_box('rsvplanding-box-id', $screen->id, 'advanced');
}

add_action('add_meta_boxes', 'plt_hide_rsvpmaker_metaboxes', 20);