Step::1 Login to your cPanel
Step::2 Open the File Manager section under Files category
Step::3 Now go to public_html and then find your WordPress installation directory
Step::4 Look for wp-config.php file and right click over the file and choose the Edit option
Step::5 Add the following code under define (‘WP_DEBUG’, false’); line
define ( 'DISALLOW_FILE_EDIT', true);
Step::6 Once you’re done with the changes, click over Save Changes
Congratulations, you have successfully disabled the WordPress editor for Themes and Plugin.
Visit our Blog for more details. You can also watch the video here.