Opal Estate Pro supports overwrite template via main theme or child-theme.
Opal Estate template files contain the markup and template structure for frontend and HTML emails of your store.
When you open these files, you will notice they all contain hooks that allow you to add/move content without needing to edit template files themselves. This method protects against upgrade issues, as the template files can be left completely untouched.
Template files can be found within the /wp-content/plugins/opal-estate-pro/templates/