After adding multisite network, for my domain and subdomain the "editor" link in "Appearance" and "Plugin" is missing in Wordpress.
Can someone say why ?
I do not have this in wp_config.php
define('DISALLOW_FILE_EDIT', true);
I assume you are talking about the admin dashboard of the main site. This is normal. Now that you have a network, the editor is only visible in the network admin dashboard.