The latest WordPress version 5.0 introduced the Gutenberg Editor / Block Editor replacing the old Classic Editor. Today we will be discussing on how we can disable the Gutenberg Editor and get back the Original Classic Editor in WordPress without using any 3rd party plugins or the Classic Editor Plugin.
You can switch back to the classic editor by installing the Classic Editor or by disabling the Gutenberg plugin. In fact, the classic Classic Editor editor code, which was not deleted in WordPress 5.0, is just a switch.
How to Switch to Classic Editor in WordPress 5.0 Without any Plugin?
You can very easily disable the Gutenberg Editor in WordPress 5.0, you just need to add the below code in the functions.php file of your theme.
add_filter('use_block_editor_for_post', '__return_false');
You can find the functions.php file in the wp-content/themes directory inside your theme folder. You can also edit the file directly from WordPress, to do so head over to Appearance >> Theme Editor and edit the functions.php file.
After doing the above step the Gutenberg editor will be disabled and the old Classic Editor will be restored, however, the front-end will still load the relevant style files for the Gutenberg editor and to complete disable those too add the below line of code into your functions.php just below the above code.