The classic editor is a very similar system to what v4 used and is recommended for older websites that are not responsive.
1: Navigate to the page you wish to edit in the Classic Editor by going to Content and then Pages . Find your page in the list and click on it.
2: In the next page, Click the ' Classic Editor ' button. This will open the Classic Editor.
Accessing the Editor How to view a Page's Source Code Change a Page's Folder Prevent Google from indexing your Page Changing a Page's Name Updating Page Aliases How to add Keywords and Descriptions to Pages