Tips on Customizing Improved User Experience

How to Hide the "Improved User Experience" Admin Menu

function plt_hide_improved_user_experience_menus() {
	//Hide the "Settings → Improved User Experience" menu.
	remove_submenu_page('options-general.php', 'improvedUserExperience');
}

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

Where do I put this code?

How to Hide Improved User Experience Meta Boxes

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

	//Hide the "General Settings" meta box.
	remove_meta_box('improved-user-experience-general-settings', $screen->id, 'main');
	//Hide the "Like this Plugin?" meta box.
	remove_meta_box('improved-user-experience-like-this', $screen->id, 'sidebar');
	//Hide the "Need Support?" meta box.
	remove_meta_box('improved-user-experience-support', $screen->id, 'sidebar');
	//Hide the "Latest news from Xavisys" meta box.
	remove_meta_box('improved-user-experience-xavisys-feed', $screen->id, 'sidebar');
}

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

How to Hide the "The Latest News From Xavisys" Dashboard Widget

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

	//Remove the "The Latest News From Xavisys" widget.
	remove_meta_box('dashboardb_xavisys', 'dashboard', 'normal');
}

add_action('wp_dashboard_setup', 'plt_hide_improved_user_experience_dashboard_widgets', 20);