Tips on Customizing HurryTimer – An Scarcity and Urgency Countdown Timer for WordPress & WooCommerce

How to Hide HurryTimer Admin Menus

function plt_hide_hurrytimer_menus() {
	//Hide "HurryTimer".
	remove_menu_page('hurrytimer');
	//Hide "HurryTimer → All Campaigns".
	remove_submenu_page('hurrytimer', 'edit.php?post_type=hurrytimer_countdown');
	//Hide "HurryTimer → Add Campaign".
	remove_submenu_page('hurrytimer', 'post-new.php?post_type=hurrytimer_countdown');
	//Hide "HurryTimer → Settings".
	remove_submenu_page('hurrytimer', 'hurrytimer_settings');
}

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

Where do I put this code?

How to Hide the "Get the Most of HurryTimer" Meta Box

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

	//Hide the "Get the Most of HurryTimer" meta box.
	remove_meta_box('hurrytimer-upgrade-banner', $screen->id, 'side');
}

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