Tips on Customizing Fakturo

How to Hide Fakturo Admin Menus

function plt_hide_fakturo_menus() {
	//Hide "Dashboard → Fakturo News".
	remove_submenu_page('index.php', 'fakturo-about');
	//Hide "Plugins → Fakturo Add-ons".
	remove_submenu_page('plugins.php', 'fakturo');

	//Hide "Fakturo".
	remove_menu_page('fakturo_dashboard');
	//Hide "Fakturo → Dashboard".
	remove_submenu_page('fakturo_dashboard', 'fakturo_dashboard');
	//Hide "Fakturo → Providers".
	remove_submenu_page('fakturo_dashboard', 'edit.php?post_type=fktr_provider');
	//Hide "Fakturo → Add Provider".
	remove_submenu_page('fakturo_dashboard', 'post-new.php?post_type=fktr_provider');
	//Hide "Fakturo → Clients".
	remove_submenu_page('fakturo_dashboard', 'edit.php?post_type=fktr_client');
	//Hide "Fakturo → Add Client".
	remove_submenu_page('fakturo_dashboard', 'post-new.php?post_type=fktr_client');
	//Hide "Fakturo → Reports".
	remove_submenu_page('fakturo_dashboard', 'fakturo_reports');
	//Hide "Fakturo → Settings".
	remove_submenu_page('fakturo_dashboard', 'fakturo-settings');
	//Hide "Fakturo → Extensions".
	remove_submenu_page('fakturo_dashboard', 'plugins.php?page=fakturo');

	//Hide "Sales".
	remove_menu_page('edit.php?post_type=fktr_sale');
	//Hide "Sales → Invoices".
	remove_submenu_page('edit.php?post_type=fktr_sale', 'edit.php?post_type=fktr_sale');
	//Hide "Sales → Add Invoice".
	remove_submenu_page('edit.php?post_type=fktr_sale', 'post-new.php?post_type=fktr_sale');
	//Hide "Sales → Receipts".
	remove_submenu_page('edit.php?post_type=fktr_sale', 'edit.php?post_type=fktr_receipt');
	//Hide "Sales → Add New Receipt".
	remove_submenu_page('edit.php?post_type=fktr_sale', 'post-new.php?post_type=fktr_receipt');
	//Hide "Sales → Checks".
	remove_submenu_page('edit.php?post_type=fktr_sale', 'edit-tags.php?taxonomy=fktr_check');

	//Hide "Products".
	remove_menu_page('edit.php?post_type=fktr_product');
	//Hide "Products → Products".
	remove_submenu_page('edit.php?post_type=fktr_product', 'edit.php?post_type=fktr_product');
	//Hide "Products → Add Product".
	remove_submenu_page('edit.php?post_type=fktr_product', 'post-new.php?post_type=fktr_product');
	//Hide "Products → Category".
	remove_submenu_page('edit.php?post_type=fktr_product', 'edit-tags.php?taxonomy=fktr_category');
	//Hide "Products → Models".
	remove_submenu_page('edit.php?post_type=fktr_product', 'edit-tags.php?taxonomy=fktr_model');
}

add_action('admin_menu', 'plt_hide_fakturo_menus', 100);

Where do I put this code?

How to Hide the "Fakturo - Sales Summary" Dashboard Widget

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

	//Remove the "Fakturo - Sales Summary" widget.
	remove_meta_box('fktr_dashboard_widget_sale_summary', 'dashboard', 'normal');
}

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