Tips on Customizing Visualizer: Tables and Charts Manager for WordPress

How to Hide Visualizer: Tables and Charts for WordPress Admin Menus

function plt_hide_visualizer_menus() {
	//Hide "Visualizer".
	remove_menu_page('visualizer');
	//Hide "Visualizer → Chart Library".
	remove_submenu_page('visualizer', 'admin.php?page=visualizer');
	//Hide "Visualizer → Add New Chart".
	remove_submenu_page('visualizer', 'admin.php?page=visualizer&vaction=addnew');
	//Hide "Visualizer → Support".
	remove_submenu_page('visualizer', 'viz-support');
	//Hide "Visualizer → Setup Wizard".
	remove_submenu_page('visualizer', 'visualizer-setup-wizard');
	//Hide "Visualizer → About Us".
	remove_submenu_page('visualizer', 'ti-about-visualizer');
	//Hide "Visualizer → Get Visualizer Pro".
	remove_submenu_page('visualizer', 'https://themeisle.com/plugins/visualizer-charts-and-graphs/upgrade/?utm_source=wpadmin&utm_medium=index&utm_campaign=sidebarMenuUpgrade&utm_content=visualizer-charts-and-graphs');
}

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

Where do I put this code?

How to Hide the "WordPress Guides/Tutorials" Dashboard Widget

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

	//Remove the "WordPress Guides/Tutorials" widget.
	remove_meta_box('themeisle', 'dashboard', 'normal');
}

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