Last updated on July 19th, 2024.
I was going to do some tweaks to the CSS of my website. As usual, I clicked on Appearances > Customize. But instead of seeing the menu, I saw a plain grey screen. The Customize menu was hidden.

Does the same happen to you? Here’s a quick fix to that. (Kudos to the WordPress Community: WordPress – Austausch, Tipps und Hilfe which led me to the solution)
- Back-up your website.
- Login to your hosting control panel (in my case it is Plesk)
- Click on File

4. Access your wp-config.php file
5. Search for this line of code
define('DISALLOW_FILE_EDIT', true);
6. Change ‘true’ to ‘false’:
7. Save
In case you can’t find the above code snipped. Insert a new line with the code.
define('DISALLOW_FILE_EDIT', false);
Hope that helped!