It only takes a minute to sign up. Connect and share knowledge within a single location that is structured and easy to search. Generally the answer is no. Gutenberg stores content in a different format than how the pre 5.
Or using one of existing plugins
Why users want to disable Gutenberg Editor?
Do you want to disable Gutenberg block editor and keep the classic WordPress editor on your site? Gutenberg is the default block editor in WordPress which has replaced the classic WordPress editor. A lot of users find it hard to adjust to and would prefer to keep the classic editor. In this article, we will show you how to easily disable Gutenberg and keep the classic editor in WordPress. Gutenberg is the developmental name for the block editor in WordPress. The block editor was created with a goal to modernize the WordPress writing experience. It attempts to work like a page builder plugin and allows you to drag and drop items into a post or page.
Disable Gutenberg Editor in WordPress: It Won’t Affect Your Site
You can disable Gutenberg completely, or selectively disable for posts, pages, roles, post types, and theme templates. Plus you can hide the Gutenberg nag, menu item, and more! So you can continue using plugins and theme functions that extend the Classic Editor.