To change the document root directory in Plesk, follow these steps:
1. Firstly, log in to Plesk.
2. Secondly, click Websites & Domains in the left sidebar.
3. Then, locate the domain you want to edit, and click Hosting Setting.
4. In the Document root text box, type the file you want to use for the new document root directory.
5. Lastly, click OK. Plesk will change the document root directory.