How to Hide the "VK Grid Editor" Admin Menu

function plt_hide_vk_front_end_grid_editor_menus() {
	//Hide the "Settings → VK Grid Editor" menu.
	remove_submenu_page('options-general.php', 'vkEdit_plugin_options');
}

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

Where do I put this code?