Note: This feature comes with Grammarly Premium.
To change your domain/document type in the Grammarly Editor, click Start Assistant (or Correct with Assistant) in the upper right corner, then select Goals > Domain:
You can also get customized suggestions by selecting the Intent, Audience, Style, and Emotion of your text.
If you're using Grammarly for Microsoft Office, you can choose the Audience, Formality, and Domain (type) of your text by clicking Adjust Goals.
For more information about document types in Grammarly for Microsoft Office, please check this article.