Changing a Domain or Subdomain's Active PHP version
Start by opening the MultiPHP Manager interface by navigating to cPanel >> Software and then clicking on MultiPHP Manager:
Check the boxes on the row of each domain you want to change in the Set PHP Version per Domain section:
Select the PHP version from the list on the right-hand side of the screen above the domain list, and then click Apply:
The altered domains should now reflect the updated PHP version accordingly in the list: