Layout Override
You can easily change the group field output style with layout override feature. Output now coming as table formate and you can chagne it to any style you want.
This feature is only available on PRO version for XCF.
Create Override
Go to Extensions > Templates and click on your default template name from Template column.
On template editing screen click on the Create Overrides tabs and click xcf from Layouts column.

Edit Override File
Now go back to editor tab and you will see a folder name xcf under html > layouts > joomla. Open group.php file.

Now open the file and edit the code the way you want to output the fields.