What is a Full-Site Editor?
The Full-Site Editor is a tool that enables you to modify theme templates using blocks. It replaces the Theme Editor in past versions of WordPress.
More About Full-Site Editors
Full-Site Editing is a feature introduced in WordPress 5.8. It enables users to build and customize page templates with blocks, and replaces the Customizer.
To use the full site editor, you need a block-based theme. This is a theme that adheres to a specific set of development guidelines. When you activate a block-based theme on your site, WordPress will automatically disable the Customizer and Widget sections within the dashboard.
Full-site editing also enables the use of a new theme.json file for themes. You can use this file to configure default styles for a theme, including background colors, content width, fonts, and more.