When you open an existing post after you’ve switched to the block editor version of WordPress, you’ll notice that the post is not converted to individual blocks, but appears in a single Classic Editor Block with a familiar toolbar and options. But, what if you want to copy a format used elsewhere on the site that hasn’t been converted to blocks yet? You can create a new post using the Classic Editor block.
How to Create a Classic Editor Post
Once you’ve added your title, you can click on the classic icon to add a Classic Editor button.
Or you can click to add a block and search by typing Classic Editor in the search bar.
I encourage you to use the new blocks as they give you a lot of flexibility and options, but there might be a situation where using the classic editor is better and that’s easy to do too.