Do you want to disable Gutenberg and keep the WordPress Classic Editor? Go through the step by step article. WordPress 5.0 has been released. In this update WordPress has used Gutenberg as their default editor. But some users like the old Classic editor. Though Gutenberg is mainly an advanced page builder, it needs some time to fit it completely with core WordPress.
How to Disable Gutenberg and Keep the WordPress Classic Editor?
Following this process your default editor will be classic editor but you can switch to Gutenberg anytime. For this you just need install and activate Classic Editor of WordPress.
To install Classic editor head over to Plugins directory from your Dashboard. You can navigate to Dashboard->Plugins->Add New and here type the keyword Classic Editor in the search box.

After installation activates the newly installed plugin. For this, you can go to Dashboard->Plugins->Installed Plugins

Then click on Activate button of the Classic editor as shown in the screenshot.
You’re done. Activating the Classic editor will replace Gutenberg as the default editor. But you use Gutenberg whenever you want.
Notice: If you don’t know how to install a WordPress Plugin, you can go through How to manage WordPress Plugin.
How to Switch from Classic editor to Gutenberg?
|Following the steps above you can switch to Gutenberg from the Classic editor anytime. You can use Gutenberg while writing a Page/Post.
To move to Gutenberg just move to the bottom of a page or post. At the right sidebar of a Page/Post, you can see a section named Editor. From there click on Switch to Block Editor.

This will switch your Classic editor to Gutenberg. At the same time you can back to Classic editor.

This is all for now. You may also like to read how to replace Gutenberg with Classic editor.
I hope this will help you to Disable Gutenberg and Keep the WordPress Classic Editor. If you have any questions beyond this article, feel free to leave a comment below.