Multisite converted to Single Site can’t add new plugins or new themes

Check your wp-config.php file and remove multisite code. remove code like define(‘WP_ALLOW_MULTISITE’, true); and define(‘MULTISITE’, true); define(‘SUBDOMAIN_INSTALL’, false); define(‘DOMAIN_CURRENT_SITE’, ‘yoursite.com’); define(‘PATH_CURRENT_SITE’, “https://wordpress.stackexchange.com/”); define(‘SITE_ID_CURRENT_SITE’, 1); define(‘BLOG_ID_CURRENT_SITE’, 1); Also, check your .htaccess file and remove those multisite.

I can´t make the menu unclickable in an easy way

You may already have discovered how to make a top-tier menu item unclickable in the Gutenberg Editor/WordPress, but I am placing this here for others to read. Use the menu block inserter to create a navigation block in your header. Add a top-tier menu item and choose a page in your list of pages. I … Read more

PHP Error in WordPress Theme

Replcace this function start_el(&$output, $item, $depth, $args) { …. with this function start_el( &$output, $item, $depth = 0, $args = array(), $id = 0 ) { …. I hope this will work.