The Classic Editor is the same rich text editor used in Apollo 1. In Apollo 2, you have the option to switch between the Classic Editor and the Block Editor at any time by going to “Pages” in the Dashboard Navigation Menu, then hover your mouse over the title of the page you would like to edit, and select Classic Editor from the options that appear below the title.
The Classic Editor is an old way to update webpage content and can pose problems on the site such as images not appearing or posts not appearing when published. We encourage you to use the Block Editor for your page and post editing needs.