Configuring document root for a website is simply assigning default status to a folder/directory on your hosting control panel. Below are the steps to configure Document Root on Plesk.
Step 1: Login to your Plesk panel
Step 2: Click on ‘Websites & Domains’.
Step 3: Next to your domain name, click on Hosting Settings.
Step 4: In ‘Document Root’ field, specify the folder name that you wish to be document root.
Step 5: Scroll down to click OK.
Note: Document root cannot be modified on Linux cPanel hosting.