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The middle part of the Workspace, the Editor, is where you directly interact with your website content. Here you can add content elements (images, paragraphs, separators, etc.), rich text and so forth to fill in the content of your website. The Editor is a WYSIWYG representation of the content of your website which means that the appearance of a content item in the Editor is exactly the same as what visitors see on the frontend of your website. This allows you to always see how your web pages, articles, page sections, and so forth look without having to take any further action.
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