Tips on Customizing Link Library

How to Hide Link Library Admin Menus

function plt_hide_link_library_menus() {
	//Hide "Link Library".
	remove_menu_page('edit.php?post_type=link_library_links');
	//Hide "Link Library → All Links".
	remove_submenu_page('edit.php?post_type=link_library_links', 'edit.php?post_type=link_library_links');
	//Hide "Link Library → Add New Link".
	remove_submenu_page('edit.php?post_type=link_library_links', 'post-new.php?post_type=link_library_links');
	//Hide "Link Library → Link Library Categories".
	remove_submenu_page('edit.php?post_type=link_library_links', 'edit-tags.php?taxonomy=link_library_category&post_type=link_library_links');
	//Hide "Link Library → Tags".
	remove_submenu_page('edit.php?post_type=link_library_links', 'edit-tags.php?taxonomy=link_library_tags&post_type=link_library_links');
	//Hide "Link Library → Global Options".
	remove_submenu_page('edit.php?post_type=link_library_links', 'link-library-general-options');
	//Hide "Link Library → Library Configurations".
	remove_submenu_page('edit.php?post_type=link_library_links', 'link-library-settingssets');
	//Hide "Link Library → Moderate".
	remove_submenu_page('edit.php?post_type=link_library_links', 'link-library-moderate');
	//Hide "Link Library → Stylesheet".
	remove_submenu_page('edit.php?post_type=link_library_links', 'link-library-stylesheet');
	//Hide "Link Library → Link checking tools".
	remove_submenu_page('edit.php?post_type=link_library_links', 'link-library-reciprocal');
	//Hide "Link Library → Donate".
	remove_submenu_page('edit.php?post_type=link_library_links', 'link-library-donate');
	//Hide "Link Library → FAQ".
	remove_submenu_page('edit.php?post_type=link_library_links', 'link-library-faq');
}

add_action('admin_menu', 'plt_hide_link_library_menus', 101);

Where do I put this code?

How to Hide Link Library Meta Boxes

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

	//Hide the "Basic Details" meta box.
	remove_meta_box('linklibrary_basic_meta_box', $screen->id, 'normal');
	//Hide the "Image" meta box.
	remove_meta_box('linklibrary_image_meta_box', $screen->id, 'normal');
	//Hide the "Full-Page Content" meta box.
	remove_meta_box('link_library_fullpage_editor', $screen->id, 'normal');
	//Hide the "Additional Parameters" meta box.
	remove_meta_box('linklibrary_meta_box', $screen->id, 'normal');
}

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

How to Hide the "Link Library" Dashboard Widget

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

	//Remove the "Link Library" widget.
	remove_meta_box('link_library_dashboard_widget', 'dashboard', 'normal');
}

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