It can be easy to forget that you have full control over the generated content and are free to manually edit it at any time. This is true for content that you are viewing from the preview shown above or after it has been inserted into the Page.
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It's best to think of the raw generated content as a rough draft. If you want to reword a sentence, change the heading level, or remove an item from a list, it can be faster to do this manually rather than re-running slightly different prompts to make minor edits.

Manually edit the generated content from the preview window.