Most Joomla templates display the site name defined in the Joomla configuration file configuration.php. Usually, the site name is set as the domain name for your website. In order to hide it, you need to delete the domain name in configuration with a blank site name.
Step 1: Login to cPanel and then go to FileManager
Step 2: Open configuration.php file under public_html folder.
Step 3: Find the below line in configuration.php
var $sitename = ‘mysite.com’;
Step 4: To hide the site name, you need to change the above line to:
var $sitename = ”;
Step 5: Finally save the file