Tips on Customizing FormBuilder

How to Hide the "FormBuilder" Admin Menu

function plt_hide_formbuilder_menus() {
	//Hide the "Tools → FormBuilder" menu.
	remove_submenu_page('tools.php', 'formbuilder.php');
}

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

Where do I put this code?

How to Hide the "FormBuilder" Meta Box

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

	//Hide the "FormBuilder" meta box.
	remove_meta_box('formbuilder_sectionid', $screen->id, 'normal');
}

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