If you want to change the default php version for newly creating domains then please follow the below steps.
1.Login to your Ovipanel (ACP).
2. Search for "Default Php Version '' module in the search box at the top of the panel in ACP.
3. Click on the "Default Php Version" option.
4. Select the Default php version which you need to set for the newly created domain.
5. Click on the Change button to set the Default php version .
From above steps you can set the php version which you need for the newly created domains in the ovipanel.