Support

No, Joomla does not provide a way to hide custom Fields. Remember that custom fields are rendered by Joomla, not ATS itself. The only change we can and do make is provide a layout (components/com_ats/layouts/akeeba/fields/render.php) to format the HTML for rendering field groups and another layout (components/com_ats/layouts/akeeba/field/render.php) to format each individual field. You can of course do a template override of the latter to create your custom rendering rules.

Also note that depending on the use case it makes sense to display empty fields more often than not. For example, you did not provide a PHP version or a Host in your ticket. This is useful for me to know when replying to a ticket. The lack of information is information in and of itself.

Finally, keep in mind that if you have sets of fields which only make sense to be filled in (and displayed!) contingent to the value of other fields you can use the ShowOn feature as described in the documentation. For example, I can have a drop-down with CMS type where you can select Joomla or WordPress. If you select Joomla I need the Joomla version and show that field. If you select WordPress I need a WordPress version so I hide the Joomla version field and show you the WordPress version field. If you do not fill in the respective CMS version field I still need to know that you did that.